In mice there are two loci responsible for coat color: Locus 1B- determines whether hair has bands: B- results in hair with bands & produces an agouti coat pigment (brown) b- homozygotes have no bands & their coat pigment is black Locus 2A- affects enzymes responsible for pigment production: A- results in normal pigment production a- homozygotes block all of the pigment production & are albino (white) What are the possible genotypes & phenotypes of the progeny if you were to cross 2 mice, which are heterozygous for both traits? What type of gene action is being expressed in this example?

In mice there are two loci responsible for coat color: Locus 1B- determines whether hair has bands: B- results in hair with bands & produces an agouti coat pigment (brown) b- homozygotes have no bands & their coat pigment is black Locus 2A- affects enzymes responsible for pigment production: A- results in normal pigment production a- homozygotes block all of the pigment production & are albino (white) What are the possible genotypes & phenotypes of the progeny if you were to cross 2 mice, which are heterozygous for both traits? What type of gene action is being expressed in this example?

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Description: In mice there are two loci responsible for coat color: Locus 1B- determines whether hair has bands: B- results in hair with bands & produces an agouti coat pigment (brown) b- homozygotes have no bands & their coat pigment is black Loc

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter15: Genomes And Genomics

Section: Chapter Questions

Problem 1QP: The gene controlling ABO blood type and the gene underlying nail-patella syndrome are said to show...

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At least two pairs of genes control eye color. Both pairs influence the production of the pigment, melanin, but act independently. One pair of alleles is B (Brown color; dominant) and b (blue color); the other pair is A (pigment production; dominant) and a (no pigment production; albino). The gene pair aais epistatic to (masks) B and b and produces the nonpigmented eyes of the albino. What is the typeof gene interaction that exists between the two gene pairs? Give the genotypes and phenotypes of the possible offspring of the mating bbAa x Bbaa andi ndicate the parental phenotypes. (any method)
Several loci affect hair development in dogs. The allele for wire hair (W) is dominant to Its allele for straight hair (w). Allow H to represent hairlessness in the Mexican hairless dog and its recessive allele h to represent the gene for typical hair growth in other breeds. The Mexican hairless dog is homozygous for straight hair, but because of epistatic effects of H, alleles for hair formation cannot be expressed. Write genotypes of the following animals with respect to the two loci mentioned. a.) a Mexican hairless dog b.) a dog with straight hair c.) a dog from a strain that is pure breeding for wire hair.
Two hedgehog parents are heterozygous at the spiny locus, each with genotype Ss. This locus affects the length of the individuals’ spines, which ranges from 1 cm in SS homozygotes to 3 cm in ss homozygotes.Inheritance of spine length in this family is entirely due to the spiny locus and it exhibits additivity. Remember that development of spines depends on thousands of genes, but we’re only considering this one gene because it’s the one that varies in a way that affects spine length in this family. a) List all of the phenotypes we could observe among offspring of these Ss heterozygote parents. b) What’s the probability that an offspring of these heterozygous parents is an SS homozygote? c) If the parents have exactly two offspring, what is the probability that the two hedgehog kids have no alleles in common? In other words, what’s the probability that one kid is SS and the other ss?
In rabbits fur colour can be either gray black or blotchy. Blotchy is present as grey and black spots present in no specific pattern males are almost always are the grey or black while females can be gray, black or blotchy. However, a male individual is found that shows the blotchy pattern, and you, expect a nondisjunction event might to be to blame. Explain the inheritance of coat colour in rabbits and also provide an explanation for the blotchy male.
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The gene controlling ABO blood type and the gene underlying nail-patella syndrome are said to show linkage. What does that mean in terms of their relative locations in the genome? What does it mean in terms of how the two traits are inherited with respect to each other?
The dosage of X chromosome expression is equalized between male and female mammals. Think about the example of calico cats to answer the following questions. Use Xb to represent the allele for black fur, XB to represent the allele for orange fur. What genotype(s) of female cats is/are expected to have a calico coat? Is it possible to have a calico cat that is male? Explain.
In mice, gene A is epistatic to gene B. Dominant allele "A" allows for pigment to be transported to the fur; recessive allele "a" prevents the transport of pigment to the fur, resulting in an albino mouse. Dominant allele "B" gives agouti fur color; recessive allele "b" gives black fur color. What phenotype would you expect from a mouse with "aaBb" genotype? * A.black and white fur B.albino fur C. agouti fur D. black fur
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You are interested in studying position effect variegation in Drosophila using the chromosome depicted below: Deactivation of the w+ gene gives a white eye phenotype and deactivation of the rst+ gene gives a rough eye phenotype; the normal phenotypes are red and smooth. Because the rst+ and w+ genes have now been placed close to a heterochromatic domain, some sections (or sectors) of the eye display mutant phenotypes due to gene deactivation while others display the normal, wild type phenotype. Which phenotype would you not expect to see rst w Inverted X chromosome white smooth eye sectors white rough eye sectors red smooth eye sectors red rough eye sectors