A coat color gene in guinea pigs has alleles that produce the following phenotyp

Question

A coat color gene in guinea pigs has alleles that produce the following phenotypes: C/C - black c^k/c^k = sepia c_d/c_d = cream c^a/c^a = albino Assuming that these alleles show complete dominance in the order C > c^k > c^d > c^a, what are the most probable genotypes for the parents In the following crosses? Write the genotypes using the allele designations above. Imagine a large guinea pig population in which these four coat color alleles occur with equal frequency {i.e., C = c^k = c^d = c^a = 0.25). In this population, there are no selective forces operating on coat color and matting are entirely at random with respect to coat color. Assuming that this population is at Hardy-Weinberg equilibrium, determine the expected frequencies of these coat color genotypes: C/C C/c^d C/c^k C/C^a Now determine the expected frequencies of these coat color phenotypes: black; sepia; cream; albino If all of the albino individuals were removed from the population and not permitted to breed, what frequency of albino offspring would you expect to get in the following generation? In shampoos. a dominant allele (H) causes a hairless phenotype. An independently-assorting dominant allele (S) suppresses the hairless phenotype, but otherwise has no effect on shampoo hair. Hand S are each lethal in the homozygous condition. For each of the following crosses, determine the proportion of hairless shampoos among the viable progeny: H/+; S/+ x H/*; S/+ H/+; +/+ X H/*; S/+ H/+: S/+ X +/+; S/+

Explanation / Answer

a) The genotype of parents with the progeny 22 black and 7 albino is CCcaca(black) and CCcaca (black)

The genotype of parents with the progeny 13 black and 12 cream is CCcdcd(black) and cacacaca (albino).

The genotype of parents with the progeny 24 sepia, 12 cream and 12 albino is ckckcaca(sepia) and cdcdcaca

cream

The genotype of parents with the progeny 18 black, 8 sepia and 6 cream is CCcdcd(black) and ckckcdcd

sepia

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