What causes the Bottleneck Effect?
A. When populations enjoy having an unlimited amount of resources
B. A large loss in the population due to a dramatic event
C. When a few individuals leave a population to begin their own
D. A new species diverges from the original population and develops new alleles
Answers
The causes of Bottleneck Effect is option B A large loss in the population due to a dramatic event.
Bottleneck effect explained.
The bottleneck effect is a genetic phenomenon that occurs when a large percentage of a population is eliminated due to a catastrophic event such as natural disasters, disease outbreaks, hunting or overfishing, or habitat loss. As a result, the genetic diversity of the population is drastically reduced, and many alleles are lost.
The surviving individuals may have a different genetic makeup than the original population, and the gene pool may be skewed. This can lead to a loss of genetic variation, reduced fitness, and increased susceptibility to disease and environmental stress.
The bottleneck effect can have long-term evolutionary consequences, as the surviving population may have to adapt to new environmental conditions with a limited set of genetic resources. This can result in the emergence of new species or subspecies, as the surviving population may have unique alleles or traits that differentiate them from the original population.
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Related Questions
Why do phospholipids tend to spontaneously orient themselves into something resembling a membrane?
Answers
The hydrophobic, nonpolar regions of Phospholipids must align with each other in order for the structure to have minimal potential energy and, consequently, higher stability.
Because their fatty acid tails are poorly soluble in water, phospholipids spontaneously form bilayers in aqueous solutions, with the hydrophobic tails buried in the interior of the membrane and the polar head groups exposed on both sides, in contact with water.
Phospholipids in the lipid bilayer of a cell membrane orient themselves so that the heads face outward because the heads containing the phosphate group are hydrophilic and the cytoplasm of the cell is an aqueous environment.
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Similar features between different organisms resulting from common ancestry such as forelimbs of some animals, similar embryos, and dna is called:______
Answers
Similar features between different organisms resulting from common ancestries such as forelimbs of some animals, similar embryos, and dna is called homology.
Homology refers to the similarity between different biological structures or sequences that can be traced back to a common ancestor. Homologous structures are those that share a similar origin, despite their different functions or appearances in different species. For example, the forelimbs of humans, bats, and whales all share a common underlying structure, indicating that they are homologous structures.
Homologous sequences refer to genetic sequences that share a common ancestry, indicating that they have been inherited from a common ancestor. These sequences may have diverged over time due to mutations, but they still share a significant amount of similarity. Homology is an important concept in evolutionary biology, as it allows scientists to study the relationships between different species and to understand the evolutionary history of life on Earth.
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invasive dental procedures can permanently or temporarily alter gustation. if taste sensations at the tip of the tongue are absent, which cranial nerve is most likely to be affected?
Answers
If taste sensations at the tip of the tongue are absent, Glossopharyngeal cranial nerve is most likely to be affected.
What is nerve?Nerves function as conduits for electrical impulses between your brain and the rest of your body. These impulses assist you in feeling feelings and moving your muscles. They also perform autonomic activities such as breathing, sweating, and digestion. Neurons are another name for nerve cells. In the human body, nerves are categorized into three categories based on their activities. There are three types of nerves: sensory nerves, motor nerves, and mixed nerves. A nerve is a cord-like structure made up of fibers that carry sensory and motor impulses between the brain, spinal cord, and other parts of the body.
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Open Ended - Describe the components and interactions of one body system. (Cardiovascular)
Answers
Solution:
The cardiovascular system consists of two pumps (left and right ventricle) and two series of circuits:
Pulmonary circuit and systemic circuit.
The systemic circuit:
This circuit begins in one of the great vessels, the aorta, which branches into smaller vessels to the capillaries that finally reach the organs.
Now, the vascular components include arteries, arterioles, and capillaries:
Arteries: they are thick-walled vessels, the blood that circulates in these vessels has high pressure and they carry oxygenated blood to the body's tissues.
Arterioles: they are branches of the arteries.
Capillaries: they have larger surface areas and cross-sections and are the sites of exchange for nutrients, water, and gases.
on the other hand, the vascular components also include the venous circuit, in this circuit, the venules (smaller veins) join to form larger veins until the larger vein, the vena cava, returns blood to the heart:
Veins: thin-walled vessels where blood circulates with low pressure. These vessels contain most of the blood that flows in the cardiovascular system.
Venules: they are the component with the highest permeability in the microcirculation.
Pulmonary circuit:
In the pulmonary circuit, deoxygenated blood leaves the heart's right ventricle and passes into the pulmonary artery (pulmonary artery trunk). The pulmonary artery trunk divides into the right and left pulmonary arteries.
The right and left pulmonary arteries carry deoxygenated blood to the arterioles and capillary beds in the lungs. In this location (lungs), carbon dioxide is released and oxygen is absorbed. The oxygenated blood then passes from the capillary beds through the venules into the pulmonary veins. The pulmonary veins carry it to the left atrium of the heart. The pulmonary arteries are the only arteries that carry deoxygenated blood, and the pulmonary veins are the only veins that carry oxygenated blood.
The heart:
The heart is located between the lungs in the center of the chest (inferior mediastinum), behind, and slightly to the left of the breastbone.
The heart is wrapped in a membrane composed of two layers, this membrane is called the pericardium.
The outer layer of the pericardium surrounds the source of the major blood vessels of the heart and is attached to the spine and diaphragm by ligaments.
The inner layer of the pericardium is attached to the heart muscle (myocardium). A layer of fluid separates the two layers of the membrane, allowing the heart to move as it beats while remaining attached to the body.
The heart has four chambers.
The upper chambers are called atriums and there are two of them: left atrium and right atrium.
On the other hand, the lower chambers are also two and are called left ventricle" and "right ventricle.
A muscular wall called the septum separates the left and right atria and the left and right ventricles.
The left ventricle is the largest and strongest chamber in the heart. In fact, the walls of the left ventricle are strong enough to push blood through the aortic valve to the rest of the body.
Valves are those that control the flow of blood in the heart. These valves are 4.
The tricuspid valve controls blood flow between the right atrium and the right ventricle.
The pulmonary valve controls blood flow from the right ventricle to the pulmonary arteries. Note that the pulmonary arteries carry blood to the lungs to oxygenate this blood.
The mitral valve allows oxygenated blood from the lungs to pass from the left atrium to the left ventricle.
The aortic valve allows oxygen to pass from the left ventricle to the aorta, the largest artery in the body, which carries blood to the rest of the body.
On the other hand, the heart works through a special network of the myocardium, which stimulates the heart to contract. This electrical signal originates from the sinoatrial (SA) node located in the upper part of the right atrium.
Electrical impulses from the sinoatrial node travel through the muscle fibers of the atria and ventricles, stimulating their contraction.
A white guinea pig and a black guinea pig are crossed. All of the guinea pigs that are born are white. (a) What is the genotype of the black guinea pig? (b) Explain the result:
Answers
(a) The genotype of the black guinea pig is Bb.
The genotype of the black guinea pig can be determined by the help of the Punnett square. According to the question, we are given that a white guinea pig and a black guinea pig are crossed. All of the guinea pigs that are born are white. Therefore, the genotype of the black guinea pig will be Bb, where B represents the dominant allele for black color and b represents the recessive allele for white color.
(b) The reason behind this result is due to the dominance of the black color over the white color. This is known as the Mendelian principle of dominance. Since the black guinea pig was heterozygous, meaning it carried one dominant allele (B) and one recessive allele (b), it expressed the dominant black color. All the offspring of this cross, which would have received a dominant B allele from the black guinea pig and a recessive b allele from the white guinea pig, would have also been black in color. Therefore, the offspring's phenotype would have been determined by their genotypes, and they would all be black.
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Which of the following provides evidence that all living things share common ancestors?
1.Fossil record
2.Analogous Structures
3.Homologous Structures
4.Similarities in DNA sequences
a. All of these
b. 1, 3 and 4
C.4 only
d. 2 and 3 only
Answers
Answer:
a. All of these
Explanation:
All of these options are correct
COVID-19 Vaccine: How to Overcome Distribution Bottlenecks and Boost Success
The supply chain’s ability to support the massive rollout of the COVID-19 vaccine is being put to the test. Temperatures, transportation distances, volume - and even the timing of the vaccine’s second dose - are all critical factors. To ensure a responsive COVID-19 supply chain in the face of such daunting variables, leaders must have visibility, transparency, flexibility and foresight.
As the first COVID-19 vaccine developed by Pfizer and BioNTech is rolled out in the U.S., U.K. and other parts of the world and another 987-odd drugs and vaccines are in development (with 16 in the final phase) as of Dec. 15, 2020, pharma companies, Contract Manufacturing Organizations (CMOs) and suppliers are racing against time to put in place a sound production and supply chain plan so the vaccines can reach people speedily and securely.
There are, however, considerable uncertainties and variables at this stage that can impact the production and distribution of the vaccine:
Uncertainties on approvals: It’s not entirely clear how many vaccines will be approved. This affects the total amount of vaccine doses available (in the short to medium term) and consequently, production and distribution capacities.
Nature of vaccine: An approved vaccine that needs a continuous cold chain and specified temperature range will impact not only its distribution and allocation, but it will also have have specific packaging requirements (for some vaccines, packaging must withstand temperatures as low as minus 80 degrees Celsius). Both Pfizer and Moderna vaccines must be stored at below-zero temperatures, with the Pfizer vaccine requiring dry ice and special refrigeration.
Number of vaccinations needed: How much vaccine a country needs depends on the population to be vaccinated and the vaccination timeline. This depends on public health care capabilities and government policies. For example, there will be no compulsory COVID-19 vaccinations in Germany.
Efficacy of vaccine: The efficacy rate of a vaccine will decide how often people need to be vaccinated to contain the pandemic, which will impact production and distribution. For example, the Pfizer and Moderna vaccines require two doses that must be administered in a short sequence to be effective, so there cannot be a lag in the supply chain.
QUESTION 1 [15 MARKS]
Identify five (5) strategies that can be utilised to counteract conflict in supply chain management. Provide examples based on the case study.
Answers
These strategies promote collaboration, agility, and adaptability, which are vital for overcoming conflicts and challenges in supply chain management during the distribution of COVID-19 vaccines.
1. Establishing strong partnerships and collaboration: Pharma companies, CMOs, and suppliers can form strategic partnerships to share expertise, resources, and knowledge, thereby enhancing the efficiency and effectiveness of the supply chain. For example, Pfizer and BioNTech collaborated with logistics providers and airlines to ensure the smooth transport and distribution of their COVID-19 vaccine, leveraging their respective capabilities.
2. Implementing real-time visibility and tracking systems: Deploying advanced technology solutions like Internet of Things (IoT) sensors, blockchain, and data analytics can provide real-time visibility into the supply chain, enabling stakeholders to identify and address bottlenecks proactively. This helps in ensuring timely deliveries and reducing wastage. For instance, monitoring temperature-controlled shipments using IoT sensors can help maintain the required cold chain for vaccines like Pfizer's and Moderna's.
3. Diversifying suppliers and manufacturing sites: Having multiple suppliers and manufacturing sites spread across different regions can mitigate the risk of disruptions. Pharma companies can work with multiple CMOs and suppliers to ensure redundancy in production capacity. This approach allows for flexibility in case of unforeseen events, such as manufacturing issues or transportation disruptions.
4. Developing contingency plans: Preparing contingency plans for potential challenges, such as vaccine approval delays or changes in government policies, can help minimize the impact on the supply chain. These plans should include alternative distribution channels, storage facilities, and transportation options. For example, pharma companies can maintain buffer stocks in strategic locations to handle unexpected demand surges or supply shortages.
5. Enhancing communication and transparency: Open and transparent communication among all stakeholders is crucial to address conflicts and align expectations. Sharing information on vaccine availability, distribution plans, and any changes in requirements can help stakeholders make informed decisions. Regular updates and coordination between governments, healthcare providers, and supply chain participants are essential for successful vaccine distribution.
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In Rutherford’s experiment, why were some particles deflected a small amount?
Answers
In the Rutherford's experiment the most particles have the same charge, so the same charges repel each other therefore the particles deflected.
In Rutherford’s experiment, why were some particles deflected a small amount?In the Rutherford's experiment some of the particles deflected, honestly the Rutherford thought that the particles would fly straight through the foil. However, he found that the particles path would be shifted or deflected when passing through the foil. This is due to the fact that like charges repel each other. But the main reason is that the positive charge of the atom is spread throughout the atom that repelled and deflected the positively charged α-particles.
So we can conclude that in the Rutherford's experiment the most particles have the same charge, so the same charges repel each other therefore the particles deflected.
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Plzzzzz help meeeee plzzzzzzz
Answers
Answer:
59 is false and 60 and true
Explanation: I think it is right sorry if it is wrong. I hope this helps
Answer: 1) True 2) True
Explanation:
is this a balanced equation yes or no?
Na(g)+2HCl(g)⇒H2+2NaCl(s)
Answers
1. In 1889, August Weismann, a German biologist, conducted an experiment attempting to produce mice
without tails. He cut the tails off adult mice and then allowed them to mate. All offspring had long tails.
He repeated the experiment many times, always with the same results. This experiment helped to
disprove the concept of
a. Inheritance of acquired traits
b. Survival of the fittest
C. Overproduction in a species
d. Struggle for existence
Answers
Answer: inheritance of acquired traits
Explanation: I took the test and aced it so I hope this helped!!
9. Which density-dependent factors other than the predator/prey relationship affected the
populations of moose and wolves on Isle Royale?
a. extreme temperatures for the moose and flooding for the wolves
b. parasitic wasps for the wolves and clear-cut forest for the moose
e, a hurricane followed by drought for both moose and wolves
d. food availability for the moose and disease for the wolf
Answers
what is the major advantage of selective serotonin reuptake inhibitors (ssris) over other types of antidepressant therapy?
Answers
Because they typically have fewer side effects than most other types of antidepressants.
By raising serotonin levels in the brain, SSRIs alleviate depression. One of the chemical messengers, or neurotransmitters, that communicate between brain nerve cells is serotonin (neurons).
Serotonin reabsorption (reuptake) into neurons is inhibited by SSRIs. As a result, there is more serotonin accessible, which enhances neural communication. Because they primarily impact serotonin and not other neurotransmitters, SSRIs are referred to as selective. In addition to treating depression, SSRIs can also be used to treat anxiety disorders.
Hence, SSRIs are typically the first choice medication for depression.
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dna from a newly discovered virus was purified, and uv light absorption was followed as the molecule was slowly heated. the absorbance increase at the melting temperature was only 10% of the original dna. what can we hypothesize regarding the nature of the genetic material from this virus?
Answers
We postulate that the genetic makeup of this virus may contain a small amount of intramolecular base-pairing.
How does genetics function?Genetics is the study of genes and heredity, or how specific traits or qualities are passed from mother to child as a result of changes in DNA sequence. A gene is a segment of DNA that contains the instructions necessary to build one or more chemicals that help the body function.
What factors are genetic?One gene mutation can result in a genetic illness. multifactorial inheritance problem, by a mix of gene mutations with environmental variables, or by damage to chromosomal variations in the number of structure of all the chromosomes, or monogenic disorder caused by mutations in several genes
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If you gave a person with primary hypothyroidism (iodine deficiency) an injection of TSH would T3 and T4 levels increase? Why or why not?
Answers
no. Due to iodine deficiency, even if you stimulated the thyroid gland with TSH, you will not identify an increase in T3 and T4 synthesis in these individuals.
Thyroxine (T4) and triiodothyronine, two thyroid hormones, are produced by the thyroid gland from iodine, which is present in a variety of diets (T3). In the body, iodine can only be absorbed by thyroid cells. To produce T3 and T4, these cells mix the elements iodine and tyrosine. Iodine is a key necessary mineral without which the thyroid cannot produce enough amounts of T4 and T3. The pituitary, a gland located directly below the brain, is responsible for controlling thyroid activity. Thyroid-stimulating hormone (TSH) is created by the pituitary, and it encourages the thyroid to make T3 and T4.
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if each of tree has 163 species of beetles that are found only on that type of tree but no others, how many species of beetles are there in tropical trees?
Answers
Answer:
226 is your answer pls mark brainlest
Which statement about population monitoring is false?
Answers
The false statement about population monitoring is "Population monitoring is only necessary for endangered species" because Population monitoring is important for all species, not just endangered species.
Option C. statement is false.
Monitoring populations can provide valuable information for managing and conserving wildlife, as well as assessing the health of ecosystems. By tracking changes in population size, structure, and distribution over time, managers can identify trends and potential threats, and take action to mitigate negative impacts.
It is important to monitor populations of all species, including those that are not endangered, to ensure their long-term survival and ecological functioning.
Therefore, statement C is false.
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The question is incomplete. the complete question is:
Which statement about population monitoring is false?
A) Population monitoring is the process of observing and recording changes in the size, structure, and distribution of a population over time.
B) Population monitoring can provide important data for conservation and management of wildlife species.
C) Population monitoring is only necessary for endangered species.
D) Population monitoring methods include visual surveys, radio-telemetry, and genetic analysis.
Which of the following is an example of pseudoscience?
A. Horoscopes
B. Biology
C. Radiometric dating
D. Electromagnetism
Answers
Answer:
Horoscopes
Explanation:
Pseudo is a prefix that means fake or false. So pseudoscience is science that is not proven to work. All the other answer options are proven areas of science except horoscopes, which are a (not proven) way of predicting the future.
What is the term for a female reproductive cell?
sperm
egg
tetrad
embryo
Answers
Answer:
Second choice; egg
Explanation:
Gametes are an organism's reproductive cells.
- Female gametes are called ova or egg cells
- Male gametes are called sperm
A tetrad consists of four chromatids, and a chromatid is one half of a duplicated chromosome.
An embryo is an unborn offspring (child) developing.
Answer:
Egg
Explanation:
The egg also known as ovum is the female reproductive cell.
What is the evidence that an asteroid collision has happen before?
Answers
Answer:
The first clue that an asteroid had struck earth at around the same time as the mass extinction was the amount of iridium around the K-T boundary. Another clue was that they found that most animals that lived in the cretaceous died when the asteroid crashed and they found bones of animals from the cretaceous.
if mules were no longer sterile but could produce offspring, then there are no other reproductive barriers to overcome.truefalse
Answers
The statement; "if mules were no longer sterile but could produce offspring, then there are no other reproductive barriers to overcome" is true.
What is sterility?Sterility is the state of being free from living microorganisms or germs that can cause infection or disease. It refers to the absence of viable microorganisms in a given environment, such as a surgical instrument, a medication, or a medical implant.
Sterility is a critical factor in many medical and industrial processes, as the presence of microorganisms can compromise the safety and efficacy of a product or procedure. Sterilization techniques, such as heat, radiation, or chemicals, are commonly used to achieve sterility in various settings.
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A biology class is studying the effect of temperature on the amount of growth of duckweed in an aquarium. What type of data will the class need to collect, and which tools will most likely be used?
They will gather qualitative data, using a thermometer and a hand lens.
They will gather qualitative data, using a meterstick and a flask.
They will gather quantitative data, using a thermometer and a balance.
They will gather quantitative data, using a beaker and a timer.
Answers
Answer:
\(\boxed {\boxed {\sf They \ will \ gather \ quantitative \ data \ using \ a \ thermometer \ and \ a \ balance}}\)
Explanation:
First, let's identify the tools needed.
Since the biology class is studying the temperature, they will likely need a thermometer. Also, they are gathering information about the growth of the plants. This could use a balance of a meterstick.
Next, recall the difference between quantitative and qualitative data.
Quantitative: Measurable and numerical results found using scientific instruments/devicesQualitative: Data found using the senses, such as descriptions and diagrams.Since the class is measuring temperature and growth using tools, it must be quantitative data.
We can eliminate choices A and B, because they claim the class will gather qualitative data. Then, we can eliminate choice D, because a beaker and timer won't help with temperature and growth. That leaves choice C as the correct answer.
Answer:
They will gather quantitative data using a thermometer and a balance
Explanation:
First, let's identify the tools needed. Since the biology class is studying the temperature, they will likely need a thermometer. Also, they are gathering information about the growth of the plants. This could use a balance of a meterstick. Next, recall the difference between quantitative and qualitative data. Quantitative: Measurable and numerical results found using scientific instruments/devices Qualitative: Data found using the senses, such as descriptions and diagrams. Since the class is measuring temperature and growth using tools, it must be quantitative data. We can eliminate choices A and B, because they claim the class will gather qualitative data. Then, we can eliminate choice D, because a beaker and timer won't help with temperature and growth. That leaves choice C as the correct answer.
Physiological adaptations in organisms are slow to develop and do not cause a Change in the organism true or false
Answers
Answer:
The answer is B.
Explanation:
if you divide 10 divided by 2 it gives you 5 and then subtract it by 2.2 = 2.8
there goes your answer.
The people were overjoyed and _ to their boats
Answers
The people were overjoyed and take to their boats.
A boat's sides may begin to fill with water as a result of waves breaking over them, which will make the boat denser and eventually cause it to sink. Therefore, even if a boat can transport a specific amount of cargo across perfectly still water, that doesn't guarantee that it can do so safely across a choppy ocean.
What about boats?A boat is technically in the water because it is partially submerged, but it is not so immersed that the phrase "on the water" is incorrect because it is floating on the water. It can move either under its own power—typically a motor—or under the power of the elements, such as the wind, waves, or sun. The majority of boats travel partially through the water and partially above it. Hovercrafts and hydrofoils are two examples of boats with the ability to lift up and travel above the water. A boat can only stay in saltwater for approximately a week without risking damage, while three to four weeks in freshwater usually won't. The building materials on a boat never have a chance to dry out when it is left submerged. An open craft, such a rowing boat, is referred to as a boat. A boat with a cabin is used on a boat. Grease is applied to the hull of the vessel before the transfer, which enables the ship or boat to "slide" off the ramp and make its way safely into the sea. Large ships are launched via slipways, but only smaller ships can be dry-docked or repaired.
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sparrows with average sized wings survive severe storms better than those with longer or shorter wings. select one: a. gene flow b. nonrandom mating c. mutations d. natural selection e. genetic drift
Answers
sparrows with average-sized wings survive severe storms better than those with longer or shorter wings this illustrates stabilizing or normal selection. (Option D).
Stabilizing selection is demonstrated by the fact that sparrows with average-sized wings fare better in strong storms than those with larger or shorter wings.
Natural selection known as stabilizing selection occurs when nature chooses stabilized features over excessive traits. Nature does not favor features changing dramatically over time.
Negative or purifying selections are frequently mistaken for or misinterpreted as stabilizing selections.
Favoring intermediate variants under stabilizing selection helps the species survive.
The common phenotype is chosen and continues to predominate in subsequent generations.
Natural selection aids in the adaptation of a stable phenotype for increased survival rates.
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In the 1940s and 1950s, Dr Barbara McClintock studied mosaic colour patterns in corn and discovered their unstable inheritance and the underlying mechanisms. In 1983 she was awarded the Nobel Prize in Physiology/Medicine for her discovery, and is now considered one of the most influential geneticists of the 20th century. (a) Name two synonymous names for the genetic elements that Dr McClintock discovered
(b) What can these genetic elements do, and what can the consequences be for a gene and for a host genome?
(c) Which gene function do these elements require for their activity, and what are the two classes that these elements can be assigned to, and how do these two classes function in a host genome? (d) Why did Dr McClintock initially find resistance to publish her findings and in the scientific community, to the point that she did not publish these for 20 years, and why were her ground-breaking research findings a paradigm shift in the end?
Answers
They are known by two synonymous names: transposable elements or transposons. These elements can move within a genome and have various consequences for a gene and the host genome.
(a) The two synonymous names for the genetic elements discovered by Dr. McClintock are transposable elements and transposons. These terms refer to segments of DNA that have the ability to move or transpose within a genome.
(b) Transposable elements can have various effects on genes and the host genome. They can insert themselves into a gene, disrupting its function and causing mutations. They can also influence gene expression by inserting near regulatory regions, affecting the level of gene activity. Additionally, transposable elements can cause genomic rearrangements, such as duplications, deletions, or inversions, altering the structure of the genome.
(c) The activity of transposable elements requires specific genes called transposase genes. Transposase enzymes catalyze the movement of transposable elements within the genome. Transposable elements can be classified into two main classes: Class I retrotransposons and Class II DNA transposons. Class I retrotransposons transpose via a copy-and-paste mechanism, where the element is first transcribed into RNA, then reverse transcribed back into DNA and inserted at a new location. Class II DNA transposons, on the other hand, move through a cut-and-paste mechanism, directly excising from one genomic location and reinserting into another.
(d) Dr. McClintock initially faced resistance and skepticism from the scientific community, which led her to withhold publishing her findings for nearly 20 years. At the time, the prevailing belief was that genes were fixed entities with stable positions in the genome. Dr. McClintock's discovery of mobile genetic elements challenged this view and was initially met with skepticism.
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13. How does meiosis create genetic variation? Why is this important?
Answers
Answer: Meiosis creates genetic variation in a few ways. One way is through independent assortment, which is when the homologous chromosomes line up randomly during meiosis I. Another way is crossing-over, which is when homologous chromosomes break and exchange pieces during meiosis I.
Genetic variation is important because it helps ensure that the population can adapt to changes in the environment. If all the individuals in a population are exactly the same, then they are all equally vulnerable to changes in the environment, such as a new disease. However, if there is genetic variation, then some individuals may have the genes that make them resistant to the new disease. This means that the population as a whole is more likely to survive.
Explanation:
Can someone please help me, I’ve tried but I can’t figure it out
Answers
Answer: 25 percent
Explanation:
A scientist finds a fossil that she thinks might make a good index fossil.
Which characteristic does this fossil most likely have?
It is the remains of an organism still found alive today.
O It is the remains of an organism that is found in abundance nearby.
O It is the only fossil for this type of organism that has ever been found.
O It is the remains of an organism that lived in a narrow geographic area.
Answers
Answer:
it is the remains of an organism that is found in the abundance nearby
Answer:
B
Explanation:
Over 500 million years ago what was British Columbia ??
Answers
Answer:
500-million-year-old fossil found in BC is ancient ancestor of spiders and scorpions. Palaeontologists in British Columbia have found a fossil of the oldest known ancestor of scorpions and spiders.