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In cats, the gene for calico (multicolored) cats is codominant. Females that receive a B and an R gene have black and oRange splotches on white coats = calico. Males can only be black or orange, but never calico. Female genotypes must include XX and males XY. a. Show the cross of a female calico cat with a black male____________________________(0.5 pts) What percentage of the kittens will be black and male? _________ (0.5 pts) What percentage of the kittens will be calico and male? _________ (0.5 pts) What percentage of the kittens will be calico and female? _________ (0.5 pts) b. Show the cross of a female black cat, with a male orange cat. ________________________(0.5pts) What percentage of the kittens will be calico and female? ________________________ (0.5pts) What color will all the male cats be? _______________ (0.5 pts)

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8 Dec 2018

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Related questions

Coat color in cats is determined by genes at several different loci. At one locus on the X chromosome, one allele (X+) encodes black fur, another allele (X0) encodes orange fur. Another autosomal locus determines whether the fur has pigment deposited or not; one allele encodes for white fur (dominant, variable expressivity) and the other allele encodes for color (recessive). A Calico female cat (white, orange and black) mates with a black and white male cat. Using this information answer the following questions.

A. Explain how barr bodies relate to copper and black coloring in female cats. Include a definition of barr bodies and why they are present.

B. Provide a possible explanation for how expression of the gene that allows pigmentation is variably expressed in different individuals.

C. List all possible male and female cat phenotypes and genotypes.

In cats, there is a gene that produces ticked fur (bands ofdifferent colors on each hair} called agouti (H). The recessiveallele (h) for this gene produces hair that is solid color from endto end. In addition there is another coat color gene that hasrecessive albino allele (a) that prevents the production of anycoat color pigment in the homozygous recessive genotype. These 2genes are unlinked (on diferent chromosomes). An albino female catis mated to a solid brown male cat. All of their offspring areagouti. The males and females among these offspring are allowed tofreely interbreed, producing a litter of F2 kittens.

(a) What is the genotype of the albino female cat?

(b) What is the genotype oif the solid brown male cat?

(c) What is the genotype of their agouti offspring?

(d) What is the phenotypic ratio of the F2 kittens?

(e) Use a Punnett square to predict the phenotypic ratio for furcolor among the F2 kittens (Show your work)

Thanks!

1. Saguaro cacti have 2 L-shaped arms and you have one with armsthat are different lengths. Arm length in the cactus is controlledby one gene. Arms of the same length (A) are dominant to arms of adifferent length (a). What is the genotype of our cactus? If youcross our cactus with your neighbor’s cactus which has arms of thesame length and ½ of the offspring have different length arms. Whatis the genotype of the neighbor’s cactus?

2. The ability to curl your tongue up on the sides (T, tonguerolling) is dominant to not being able to roll your tongue (t). Awoman who can roll her tongue marries a man who cannot. Their firstchild has his father's phenotype. What are the genotypes of themother, father, and child? What is the probability that a secondchild will be a tongue roller?

3. A boy, whose parents and grandparents had normal vision is colorblind. What are the genotypes of his mother and his maternalgrandparents? (B = normal vision; bb = color blind)

4. The lubber grasshopper is a very large grasshopper, and is blackwith red and yellow stripes. Assume that red stripes are expressedfrom the homozygous RR genotype, yellow stripes from the homozygousrr genotype and both from the heterozygous Rr genotype. What willbe the phenotypic ration of the F1 generation resulting from across of two grasshoppers, both with red and yellow stripes (Rr xRr)? What would be the genotypic ration of the F1 generation? Whatphenotypes would be produced by crossing a grasshopper with bothcolor stripes and one with only yellow stripes?

5. Coat color in cats is a codominant trait and is also located onthe X chromosome. Cats can be black, yellow or calico. A calico cathas black and yellow splotches. In order to be calico, the cat musthave an allele for the black color and an allele for the yellowcolor. Use a punnet square to show why there are no male calicocats.

6. Consider an individual who has type O blood. Her brother hastype AB. Her father’s sister has type AB blood, and her father’sfather had a BB genotype. Her mother’s sister has type O blood, andher mother’s brother has type B blood. What are the genotypes ofher mother, father and her four grandparents?

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