14. The coat characteristics of Siamese cats and Himalayan rabbits, where proteins in the extremities function differently than in other parts of the body, is an example of ____. A. incomplete dominance B. multiple allele systems C. semilethal alleles D. temperature-sensitive allele E. None of the answers are correct 15. Which of the following diseases show pleiotropism A. albinism B. muscular dystrophy C. colorblindness D. sickle cell anemia E. male pattern baldness 16. The gene interaction demonstrated by Labrador retriever coat color, in which the F2 phenotypic ratio from an F1 dihybrid cross is 9:3:4 is known as A. complementary gene interaction B. recessive epistasis C. dominant epistasis I D. redundancy
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This is an example of temperature-sensitive alleles, where the genes that allow normal function of an organism in low temperatures will have normal genes, but in high temperatures, the function of the genes will be altered. Show more…
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In rabbits, coat color is controlled by a single gene with multiple alleles. The wild-type (c+) allele is completely dominant over the other alleles. The Himalayan (ch) allele is completely dominant over the albino (c) allele. The chinchilla (cch), Himalayan (ch), and albino (c) alleles are incompletely dominant relative to each other. A chinchilla/Himalayan heterozygote is light chinchilla with dark extremities and a chinchilla/albino heterozygote is light chinchilla. A wild-type rabbit is crossed with a Himalayan rabbit and some of the offspring are light chinchilla with dark extremities. What is the genotype of the wild-type parent?
Bryan V.
In rabbits, coat color is controlled by a single gene with 4 alleles: cC > cch > ch > c. cC = full color, cch = chinchilla, ch = Himalayan, c = colorless (albino rabbits). The Himalayan allele, which results in a black nose, ears, and paws, is only functional below 30 degrees Celsius. At higher temperatures, the protein doesn't function, and the rabbits are albino. You cross two Himalayan rabbits. When you raise the progeny at 32 degrees Celsius, you get all albino bunnies. If you raise them at 25 degrees Celsius, you get a 3:1 ratio of Himalayan to albino bunnies. What were the genotypes of the two parents?
In rabbits, an allelic series helps to determine coat color: $C(\text { full color }), c^{\text {ch }}$ (chinchilla, gray color), $c^{\text {h }}$ (Himalayan, white with black extremities), and $c$ (albino, all-white). The Callele is dominant over all others, $c^{\text {h }}$ is dominant over $c^{\mathrm{h}}$ and $c, c^{\mathrm{h}}$ is dominant over $c,$ and $c$ is recessive to all the other alleles. This dominance hierarchy can be summarized as $C>c^{\text {ch }}>c^{\text {h }}>c$. The rabbits in the following list are crossed and produce the progeny shown. Give the genotypes of the parents for each cross: Phenotypes of parents a. full color $\times$ albino b. Himalayan $\times$ albino c. full color $\times$ albino d. full color $\times$ Himalayan e. full color $\times$ full color Phenotypes of offspring $1 / 2$ full color, $1 / 2$ albino $1 / 2$ Himalayan, $1 / 2$ albino $1 / 2$ full color, $1 / 2$ chinchilla $1 / 2$ full color, $1 / 4$ Himalayan, $1 / 4$ albino $3 / 4$ full color, $1 /_{4}$ albino
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