In the snail Cepaea nemoralis, an autosomal allele causing a banded shell B^B is recessive to the allele for an unbanded shell B^O Genes at a different locus determine the background color of the shell; here, yellow C^Y is recessive to brown C^Bw
A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 are then crossed with banded, yellow snails (a testcross).
a. What will the results of the testcross be if the loci that control banding and color are linked with no crossing over?
b. What will the results of the testcross be if the loci assort independently?
c. What will the results of the testcross be if the loci are linked and 20 m.u. apart?
Answers
a. If the loci controlling banding and color in Cepaea nemoralis are linked with no crossing over, the results of the test cross will be 100% banded, yellow snails because the recessive alleles for both traits will always be inherited together.
Without recombination, all the F1 gametes will contain only these two allelic combinations, in equal proportions. Therefore, the F2 testcross progeny will be ½ banded, yellow, and ½ unbanded, brown.
b. If the loci assort independently, the results of the test cross will be a 1:1:1:1 ratio of phenotypes: 25% banded, yellow snails; 25% unbanded, yellow snails; 25% banded, brown snails; and 25% unbanded, brown snails.
c. If the loci are linked and 20 m.u. apart, the results of the test cross will be a mixture of parental and recombinant phenotypes. The recombination frequency is 20%, so each of the two classes of recombinant progeny must be 10%. The expected ratio would be:
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Related Questions
Which of the following condensed general formulas represents alcohols?
A)ROR
B)RCOR
C)RCHO
D)ROH
E)RCOOH
Answers
Answer:
the answer is part d
Explanation:
(D) Roh
All living organisms require*
-energy
-homeostasis
-4 macromolecules: Proteins, Nucleic acids, Carbohydrates and Lipids
-all of the above
Answers
Answer:
correct ans will be all of the above-------------------------&--------❤❤❤❤❤❤❤❤❤❤❤
plzz mark it as a brilliant answhat is the scientific name for a scorpion’s stinger?
Answers
Answer:
The telson. It lies at the tip of the scorpion's tail and features a bulb, where the scorpion's venom is both produced and stored.
which of the following nutrients are transported to the liver via the hepatic portal vein? none of these amino acids fatty acids monoacylglycerols
Answers
Free fatty acids and monoglycerides are transported to the liver via hepatic portal vein.
Brief summary the transportation of fatty acids and monoglycerides?Free fatty acids and monoglycerides are absorbed by the small intestine's mucosal lining and subsequently enter the epithelial cells. The endoplasmic reticulum is a mechanism inside the cell that performs lipid synthesis and transport. Once inside the cells, free fatty acids and monoglycerides enter this system. In this process, triglycerides are created from the digested products. The primary type of fat that the body stores is called triglycerides. Because of this, the digestion of fat differs from the digestion of proteins and carbs. We can observe that when proteins and carbohydrates are absorbed, their building blocks—amino acids and monosaccharides—pass through the intestinal epithelial cells unaltered. Triglycerides are coated by proteins before to leaving the epithelial cells, which causes in the chylomicron development. The triglyceride is given a water-soluble coat by the protein coating, enabling the chylomicron to exit the cell. The freshly produced chylomicrons exit the epithelial cell and go into the lacteal lymphatic capillaries. The lacteals are located in the villi, which are finger-like protrusions of the intestinal wall. Because lipids travel through the lymphatic system before returning to the bloodstream, the lacteals represent another distinctive method that fats are absorbed. As opposed to amino acids and monosaccharides, which flow directly into blood capillaries and subsequently into the hepatic portal vein, which leads to the liver, fatty acids, enter the lymphatic system during the digestion of proteins and carbohydrates. In the gut, dietary carbs are broken down to produce simple sugar molecules.
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Which statement about the specific immune response is FALSE?
Each T or B cell has antigen receptors for only one specific antigen.
T and B cells recognize antigens by using antibodies bound to their surface membranes.
Unique antigen receptors are created by genetic recombination.
Antigens must be presented by an MHC molecule for T and B cells to recognize them.
All cells express MHC-I molecules, but only antigen-presenting cells express MHC-II molecules.
Answers
Put the sentences in the correct order from start to finish.
The fish gulps water in its mouth.
The water then goes over the filaments in the gills.
In the gill filaments, dissolved oxygen in the water is exchanged for carbon dioxide in the fish.
This happens through the process of diffusion because gases flow from an area of high concentration to an area of low concentration.
The deoxygenated water passes out of the gills.
Answers
Fishes gulp water in the mouth. The water then goes over the filaments in the gills. In the gill filaments, this dissolved oxygen in the water is exchanged for the carbon dioxide in the fish. This exchange happens through the process of diffusion because the gases can flow from an area of high concentration to an area of low concentration. The deoxygenated water then passes out of the gills.
How does fishes respire in water?
A fish lives in water. It respires through a specialized organ called as gill. A gill is a respiratory organ which many of the aquatic organisms use to extract the dissolved oxygen from water and to excrete the carbon dioxide gas in the water.
Fishes gulp water in the mouth. This water then goes over the filaments in the gills of the fish. In the gill filaments, this dissolved oxygen in the water is then exchanged for the carbon dioxide gas in the fish. This exchange of gases happens through the process of diffusion because the gases can flow from an area of high concentration to an area of their low concentration. The deoxygenated water then passes out of the gills.
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Do cells divide all the time
Answers
Answer:
Yeah
Explanation:
Before a cell starts dividing, it is in the "Interphase." It seems that cells must be constantly dividing, but each cell actually spends most of its time in the interphase
Describe how the available energy in the marine ecosystem of the pacific northwest could be different than that of the african savanna
Answers
Maine ecosystem of the pacific northwest consists of open ocean and is influenced by the seasonal upwelling events and has freshwater and saline water bodies. It has an average temperature of 39 °F but is warmer near the equator.
While the African savanna is a tropical grassland ecosystem and has warm temperature year-round is characterized by grasses and dispersed trees.
The sunlight easily reaches the ground and the vegetation is dense and the climate usually warm with 20 to 30° C with an annual rainfall of 30 inches per year.
The available energy in the African savanna is Higher than the available energy in the Marine ecosystem
The African savanna is located closer to the Equator and maintains a temperature of around 20 to 30° C due to the availability of enough sunlight reaching the soil and the vegetation found in the African savanna. also there is enough rainfall all year round.
The availability of sunlight and rainfall year round makes the energy levels in the African savanna higher than the energy available in Marine ecosystem.
The Marine ecosystem which consists of Freshwater water and salt water bodies have less sunlight penetrating through them and this negatively affects the available energy ( chemical / heat ) present in the marine ecosystem.
Hence we can conclude that The available energy in the African savanna is Higher than the available energy in the Marine ecosystem.
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genetic exception laws group of answer choices require a separation of genetic information from other medical information. grant the right of death row inmates to demand genetic dna testing if they think the tests might exonerate them. grant legal custody of a child to the genetic parent in cases of in vitro fertilization or surrogate mothers. allow stem cell treatment of genetic disorders.
Answers
The correct answer is A, Grant legal custody of a child to the genetic parent in cases of in vitro fertilization or surrogate mothers.
Genetics is the study of heredity, the passing of traits from one generation to the next. It is a branch of biology that focuses on the molecular structure and function of genes, as well as their interactions with each other and the environment.
Genes are segments of DNA that contain the instructions for producing specific proteins. These proteins are responsible for carrying out various functions in the body, such as regulating growth and development, producing energy, and maintaining the immune system. The field of genetics has important applications in medicine, agriculture, and biotechnology. Medical genetics involves the diagnosis and treatment of genetic disorders, such as cystic fibrosis and sickle cell anemia.
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In a cell undergoing meiosis, if homologous chromosomes are aligned at the equator of the meiotic spindle, what process has occurred?.
Answers
In a cell undergoing meiosis, if homologous chromosomes are aligned at the equator of the meiotic spindle, the process of metaphase has occurred.
What is meiosis?Meiosis is the process of cell division in which the number of chromosomes present in the cells is divided into two.
Meiosis is the process by which the body produces the sex cells; the eggs and the sperm. These cells are called haploid cells because they have half the number of chromosomes in the somatic or body cells.
During meiosis, the cells undergo two rounds of cell divisions consisting of four stages each which are:
prophase,metaphase,anaphase, andtelophaseThe first round separates homologous chromosomes.
During the first round of division, in metaphase 1, the homologous chromosomes are arranged at the equators of the spindle fibers of meiosis.
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Which muscle(s) are not controlled by the autonomic nervous system?A. Cardiac muscle.B. The diaphragm.C. Skeletal muscle.D. Smooth muscle.
Answers
The muscle which are not controlled by the autonomic nervous system is Skeletal muscle so the correct option is C.
The muscles that aren't controlled by the autonomic nervous system are voluntary muscles. These muscles are controlled by conscious study or trouble. These muscles are responsible for voluntary movements, similar as those in the arms, legs, and other corridor of the body. Voluntary muscles are innervated by the physical nervous system, which isn't a part of the autonomic nervous system.
The autonomic nervous system controls the exertion of internal organs and glands, as well as certain aspects of action This system is responsible for a range of conditioning, including blood pressure, heart rate, breathing, digestion, and se-xual thrill.
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lonic bonds form between two negatively charged particles. *
True
False
Answers
Answer: False
Ionic bonds form after two different charged particles, like 1 electron and 1 proton. It can not be two of the same, like two negatively charged particles.
The answer is false. Hope it helps!
Producers get their energy from...
Answers
What phases do cells go through during meiosis?
Answers
Explanation:
Since cell division occurs twice during meiosis, one starting cell can produce four gametes
hope this helps
In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.
in addition to activity at some enzyme or receptor site, a successful drug must? be ? A.eliminated at a rate that prevents an unsafe level of the drug to be reached.
B.be metabolically stable enough to reach the site of action, but not so stable to remain in the patient for longer than required.
C.be ?d?istributed from the point of administrtion to the site of action.
D.be absorbed by the patient.
E.all of the above.
Answers
In addition to activity at some enzyme or receptor site, a successful drug must
The correct answer is E. All of the above.
A successful drug must:
A. Be eliminated at a rate that prevents an unsafe level of the drug to be reached.
B. Be metabolically stable enough to reach the site of action, but not so stable to remain in the patient for longer than required.
C. Be distributed from the point of administration to the site of action.
D. Be absorbed by the patient.
All of these factors are important to ensure the drug's efficacy, safety, and proper action within the patient's body in addition to activity at some enzyme or receptor site.
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How many grams of CaCO3 are needed to prepare 3.3 L of a 8 M CaCO3 solution (FW of CaCO3 = 100.09 g/mol).Do not include units in your answer. Report your answer to the nearest two decimal places.
Answers
Answer: 2642.38 g
Explanation:
This is the equation for molarity. You are being asking to find grams and we will use this equation to do just that.
Molarity = moles/liters or M = mol/L
Step 1: Identify all known given quantities.
M = mol/L
M = 8 M
mol = unknown quantity
L = 3.3
Step 2: Place known values into the equation M = mol/L.
8 = mol/3.3
Step 3: Isolate the unknown variable, in this case mol.
8 x 3.3 = (mol/3.3) x 3.3
26.4 = mol
Note: When you multiple by 3.3 on each side of the equation, you may cancel both 3.3 on the right side of the equation.
You now have the number of moles. This can be used to find the grams.
Step 4: Use moles in step 3 to find grams of CaCO3. Molar mass was provided as 100.09 g/mol for CaCO3.
26.4 mol x (100.09 g/mol) = 2642.376 g
The mol units cancel and you are left with grams.
The final answer to two decimal places = 2642.38 g
Light travels from its source in glycerin into a new medium. Which of the following materials could it be passing through? Select all that apply Air Plexiglass Diamond Helium Please explain the correct answer.
Answers
Based on the given options, the correct materials that light could be passing through when transitioning from glycerin into a new medium are:
Air: Light can travel through air as it is a transparent medium. Air is composed of molecules, and light can pass through it relatively easily, although it may undergo some refraction and scattering.Plexiglass: Plexiglass, also known as acrylic, is a transparent material commonly used as a substitute for glass. It allows light to pass through with minimal absorption or scattering, making it suitable for various applications.Diamond: Diamond is a highly transparent and refractive material. It has a high refractive index, which causes light to bend or refract significantly as it passes through. This property gives diamonds their characteristic sparkle and brilliance.Helium is not a suitable material for light transmission as it is a gas and does not possess the necessary properties to allow light to propagate through it effectively. It is important to note that while helium can be used to fill balloons and is often associated with gas lasers, it is not a material through which light can pass unobstructed.In summary, air, plexiglass, and diamond are materials that can allow light to pass through them, while helium is not a suitable medium for light transmission.
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the sensation of sound originates from the compression and expansion of air molecules on the
Answers
The following statement “the sensation of sound originates from the compression and expansion of air molecules on the" is False.
The sensation of sound originates from the vibration of objects or particles in a medium, such as air, water, or solids. When an object vibrates, it creates mechanical waves that travel through the medium, causing the particles in the medium to compress and expand. These compressions and expansions, known as longitudinal waves, propagate through the medium and reach our ears.
In the case of sound traveling through air, the air molecules are indeed involved in the process. When an object vibrates, it causes the air molecules around it to vibrate as well. These vibrations create areas of increased pressure (compressions) and decreased pressure (expansions) as the sound wave travels through the air. Our ears detect these pressure variations and convert them into electrical signals that our brain interprets as sound.
However, it's important to note that the compression and expansion of air molecules are not the source of sound but rather the means through which sound is transmitted. The actual source of sound can be various objects or phenomena, such as vibrating vocal cords, musical instruments, or any other vibrating object. The air molecules act as a medium to carry the sound waves from the source to our ears, where we perceive them as sound.
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Define hypothesis
Thx!
Answers
Answer:
a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
"his ‘steady state’ hypothesis of the origin of the universe"
When reading, what should you look for first?
Answers
The correct answer is :you should look first to the answers to your own questions.
Which type of rock is shown in each of these photographs?
Answers
In the first image, a sedimentary rock is seen. Sand, mud, and gravel deposits build up over time to produce sedimentary rocks. Typically, these sediments are laid down in layers throughout time, and after being crushed and cemented together, they solidify into rocks.
Due to the variety of sediments that make up sedimentary rocks, these rocks frequently have a layered look. In the second image, an igneous rock is seen. When molten rock, or magma, cools and hardens, igneous rocks are created.
Numerous processes, such as the cooling of lava on the Earth's surface or the crystallisation of magma deep below the Earth's crust, can lead to the formation of these rocks.
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Which of the following is not true of negative feedback loops?
Negative feedback loops maintain homeostasis.
Negative feedback loops are temporary.
In a negative feedback loop, the response to the signal or stimulus decreases the original signal or stimulus.
There are many more instances of negative feedback loops in the human body than positive feedback loops.
Answers
Answer:
The last one is not correct
Explanation:
1. in sexual reproduction, the pattern of inheritance of genes can be predicted if the genotypes or phenotypes of the parents or offspring are known. two organisms, with genotypes bbff and bbff, are mated. assuming independent assortment of the b/b and f/f genes: a) determine the expected genotypic ratios in the offspring produced. b) assuming complete dominance of the b and f alleles, how many different phenotypes would be found in the offspring?
Answers
Answer:
As genes got independently assorted and each parent provides half of its genotype and equally contributes to offspring. As in organism A with genotype BbFF has two different b and one f hence its gamete is BF and bF as one from each type. Such a way in organism B with genotype BbFf has BF, Bf, bF, and bf gametes
Explanation:
How does the design of an experiment relate to the method of difference?
Answers
Answer:
The design of an experiment is synergistically related to the method of difference. Both are required in order to test a hypothesis and deliver a conclusion or evidence.
Explanation:
im not totally sure but hope it helps
(T/F) bottleneck events are always caused by the death of most of a species’ population.
Answers
It is False that bottleneck events are always caused by the death of most of a species’ population.
An event that drastically reduces a population's size is known as a population bottleneck. The bottleneck could be brought on by a number of things, like an environmental catastrophe, the killing of a species to the point of extinction, or the destruction of a habitat that kills organisms.
Bottleneck occasions are caused when the size of a populace forcefully declines, and there are different reasons for this downfall. It frequently involves the extinction of the majority of a species' population, for example as a result of human behavior or a natural disaster like an earthquake or famine. However, it may also occur as a result of a separation event or a mass migration in which the majority of a species survives.
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for animals housed outdoors, any shelters provided to them should be:
Answers
Animals housed outdoors should be provided with shelters that offer protection from the elements and promote their well-being.
In biology, the term "animal" refers to a diverse group of multicellular organisms that belong to the kingdom Animalia. Providing shelters for animals housed outdoors is essential to ensure their welfare and safety. These shelters should protect them from extreme weather conditions such as excessive heat, cold, rain, or snow. The shelters should be designed to offer shade and insulation, preventing the animals from overheating or becoming too cold. They should also be structurally sound and resistant to harsh weather, providing a secure environment for the animals.
Additionally, the shelters should be spacious enough to accommodate the animals comfortably, allowing them to move around and lie down without restrictions. Adequate ventilation is also crucial to maintain good air quality and prevent the buildup of moisture or odours inside the shelter. Overall, shelters for animals housed outdoors should prioritize their protection, comfort, and well-being.
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6. Cells combine with similar cells to form_______?
A big cell
O Organ
O Tissue
All of the above
Answers
Tissue.
Explanation:
Cells combine with similar cells to form Tissue.
Answer:
Tissue cells.
Explanation:
Similar cells, when combined together, form tissues, and similar tissues in turn form as part of a organ. When there are multiple organs inside a organism, it would be generally termed as a organ system.
~
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how do you figure out how many electron shells are in an element
Answers
The number of electrons is equal to the atom's atomic number, which is at the top left of the element. For example, assume you want to know how many rings are in the element neon. Neon on the periodic table has an atomic number of 10, so it has 10 electrons. Square the ring number, then multiply the result by two.
The ability to use old cells is an advantage of _____.hybridization DNA testingrestriction fragment length polymorphism (RFLP) polymerase chain reaction (PCR) all DNA testing procedures
Answers
The ability to use old cells is an advantage of all DNA testing procedures.
what is short tandem repeat (str) analysis? a procedure that compares the lengths of short, repeated dna regions across samples a technique that amplifies a small sample of dna to a much larger quantity through replication an analysis that assesses variation by comparing regions of dna cut by restriction enzymes a method that identifies the sequence of nucleotides in a given strand of dna
Answers
Short tandem repeat (STR) analysis is a useful technique for genetic identification and is frequently used in paternity cases, missing people investigations, and forensic DNA testing.
Short tandem repeat (STR) analysis is a procedure that compares the lengths of short, repeated DNA regions across samples. STRs are short sequences of DNA that are repeated a variable number of times at specific locations within the genome. STR analysis is a commonly used method in forensic science to compare DNA samples from different individuals.
By analyzing the number of repeats at specific STR loci, DNA samples can be matched or excluded as coming from the same individual or from different individuals. This technique is highly discriminating and can provide strong evidence in criminal investigations or paternity testing.
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