Dog coat color genetics is actually more complicated that what is described for the Labrador dog example in your textbook. One gene locus, the A locus, has a dominant allele (AS, which gives hairs that are solid black, and aw, which is agouti (a wolf-like gray). As you know, the B locus is responsible for the difference in color between black (B-) and brown or chocolate (bb) Labradors. You also know that Labrador dogs also come in a yellow coat color. a) Set up a simple cross or set of genetic crosses that falsify the idea of the 3 colors of Labrador dogs being due to a simple multiallelic series, with black dominant to brown which is dominant to yellow.

Dog coat color genetics is actually more complicated that what is described for the Labrador dog example in your textbook. One gene locus, the A locus, has a dominant allele (AS, which gives hairs that are solid black, and aw, which is agouti (a wolf-like gray). As you know, the B locus is responsible for the difference in color between black (B-) and brown or chocolate (bb) Labradors. You also know that Labrador dogs also come in a yellow coat color. a) Set up a simple cross or set of genetic crosses that falsify the idea of the 3 colors of Labrador dogs being due to a simple multiallelic series, with black dominant to brown which is dominant to yellow.

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Description: Dog coat color genetics is actually more complicated that what is described for the Labrador dog example in your textbook. One gene locus, the A locus, has a dominant allele (AS, which gives hairs that are solid black, and aw, which is agouti (a wolf

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter11: Genome Alterations: Mutation And Epigenetics

Section: Chapter Questions

Problem 16QP: Familial retinoblastoma, a rare autosomal dominant defect, arose in a large family that had no prior...

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Dog coat color genetics is actually more complicated that what is described for the Labrador dog example in your textbook. One gene locus, the A locus, has a dominant allele (AS, which gives hairs that are solid black, and aw, which is agouti (a wolf-like gray). As you know, the B locus is responsible for the difference in color between black (B-) and brown or chocolate (bb) Labradors. You also know that Labrador dogs also come in a yellow coat color. A.) Most geneticists try the simplest genetic explanation first. Set up a simple cross or set of genetic crosses that falsify the idea of the 3 colors of Labrador dogs being due to a simple multiallelic series, with black dominant to brown which is dominant to yellow.
A made-up genetic phenotype in humans results in some people having both brown and blond body hair. It is noticeable only if you look closely and these individuals which have small. medium, and large patches of brown hair and small, medium, large patches of blond body hair spread throughout their body. a.) If this phenotype is only seen in females, males have completely blond or brown body hair, how would you describe the genetic nature of this phenotype?
A couple enters your genetic counseling clinic for some family planning advice. The woman’s father was color blind, but her own vision is normal. The man has no family history of color blindness. Neither the man nor woman have any known history of hemophilia, but their first child (a boy) has hemophilia. They ask you to calculate the chance that their nextchild will be affected by one or both conditions. You remember from your genetics training that these are both X-linked recessive conditions and that they are closely linked: in fact, their genetic loci are separated by only 10cM! During the interview with this couple, you draw the following pedigree to represent their information. Given what you know, determine for this couple what chance they have of each of the following (in the table).
The process known as (FILL IN THE BLANK) of the (FILL IN THE BLANK) chromosome in some female cats results in a calico In Rare cases, males can express the calico fur pattern. what would the be genetic explanation for this?
In a certain plant, leaf size is determined by fourgenes whose alleles assort independently and actadditively. Thus, alleles A, B, C, and D each add4 cm to leaf length and alleles A′, B′, C′, andD′ each add 2 cm to leaf length. Therefore,an AA BB CC DD plant has leaves 32 cm longand an A′A′ B′B′ C′C′ D′D′ plant has leaves16 cm long.a. If true-breeding plants with leaves 32 cm longare crossed to true-breeding plants with leaves16 cm long, the F1 will have leaves 24 cm longand the genotype AA′ BB′ CC′ DD′. Listall possible leaf lengths and their expectedfrequencies in the F2 generation produced fromthese F1 plants.
A geneticist examines an ear of corn in which most kernels are yellow, but he finds a few kernels with purple spots, as shown here. Give a possible explanation for the appearance of the purple spots in these otherwise yellow kernels, accounting for the different sizes of the spots.
Multiple crosses were made between true-breeding lines of black and yellow Labrador retrievers. All the F1 progeny were yellow. When these progeny were intercrossed, they produced an F2 consisting of 121 yellow, 9 black and 30 chocolate. What epistatic ratio and what kind of epistasis is approximated in the F2? Propose a biochemical pathway for coat color in Labrador retrievers based on the type of epistasis. Correlate each genotype with the phenotype that would occur in your pathway. Also show the frequency of each genotype. A-B- A-bb aaB- aabb
This pedigree traces the inheritance of a rare disease in humans. a. Based on this pedigree, is the allele for this disease dominant or recessive? Explain. b. What genotypes are possible for the individuals labeled 1, 2, and 3?
Your internship with Dr. Nefario at Gru Industries is going well so far, but a recent mission to obtain a shrink ray requires a special kind of Minion. You identify that the ideal Minion phenotypes for this mission are two eyes, pale yellow, and short. From your previous work, you’ve found that:Two-eyed (D) is completely dominant over one-eyed (d)Yellow (Y) is incompletely dominant with white (y)Tall (T) is completely dominant over short (t) a. The only reproductive individuals you have at the moment (it was surprise mission!) are a true breeding two-eyed, yellow, short Minion and a one heterozygous for each trait. What genotypic ratios would you expect for this crossassuming that each locus is on a different chromosome? What total proportion would you expect to be the desired phenotype for the mission? b. The mission has since been delayed due to lack of financial support, so you’ve got some time. All the individuals from the F1 cross above are now reproductive. Which genotypes would…
A recessive maternal effect mutant in zebrafish, called ichabod, results in embryos lacking heads that are non-viable. You have been instructed to identify females that are homozygous for the ichabod mutant allele. At your disposal are a tank of wild-type fish (males and females), a tank of male and female parental fish that are all heterozygous for the ichabod mutant allele (ichabodl+), and a tank of F1 fish derived from a cross between a heterozygous male and heterozygous female (ichabodl+). Which of the following would be a way to identify females that are homozygous mutant, i.e. ichabodlichabod? Select all answers that would work. Cross F1 females to F1 males and observe their offspring. Crosses that produce headless offspring came from a homozygous female. a. Cross F1 males to females from the parental tank and observe their offspring. 25% of these crosses should produce headless offspring. b. Cross F1 females to F1 males to make the F2 generation. Cross F2 females to F2 males and…
Cat fur coat color genetics is interesting. Orange fur is dominant (''B'') to black fur (''b'') and piebald, which is white spotting, is dominant (''S'') to non-white-spotted (''s''). Both of those genes are located on the X chromosome. In addition, in cats, somatic cells exhibit X-inactivation randomly, which explains why there are tortoiseshell cats (when heterozygous, have orange and black spots) as well as calico cats (orange and black but also with white spots). An orange and white spotted male is mated with a tortoiseshell female. Draw a dihybrid Punnet square to show the possible offspring:
In cattle, the gene for hornless (H) is dominant to the gene for horned (h), the gene for black (B) is dominant to that of red (b), and the gene for white face, or Hereford spotting, (S) is dominant to that for solid color (s). A cow (female) that is heterozygous for all traits is inseminated by a bull (male) of the genotype bbhhSs. What is the probability of obtaining a calf that is a black, hornless bull with Hereford spotting?