In the multiple-allele series that determines coat color in rabbits,c⁺ encodes agouti,c^ch encodes chinchilla,and c^h encodes Himalayan.Dominance within this allelic series is c⁺c^ch c^h.In a cross of c⁺/c^h $\times$ c^ch/c^h,what proportion of progeny will be chinchilla? A)0% B)10% C)25% D)50% E)100%

Question

In the multiple-allele series that determines coat color in rabbits,c⁺ encodes agouti,c^ch encodes chinchilla,and c^h encodes Himalayan.Dominance within this allelic series is c⁺>c^ch > c^h.In a cross of c⁺/c^h $\times$ c^ch/c^h,what proportion of progeny will be chinchilla? A)0% B)10% C)25% D)50% E)100%

Quizplus · Accepted Answer

The F1F1F1S1 individual is heterozygous for both alleles, meaning they carry one copy of c⁺ and one copy of c^h. The F1F1F10 individual is homozygous for c^h. When these individuals are crossed, the possible offspring genotypes and phenotypes are: - c⁺/c^ch offspring: Agouti - c^ch/c^ch offspring: Chinchilla - c^ch/c^h offspring: Chinchilla - c^h/c^h offspring: Himalayan To determine the proportion of chinchilla progeny, we need to look at the offspring with at least one copy of the c^ch allele. This includes the c^ch/c^ch and c^ch/c^h offspring. Both these genotypes will have the chinchilla phenotype since c^ch is dominant over c^h. Thus, 25% of the progeny will be chinchilla (2 out of 8 possible offspring genotypes). Therefore, the correct answer is C.

In the Multiple-Allele Series That Determines Coat Color in Rabbits,c+ ×\times×

In the Multiple-Allele Series That Determines Coat Color in Rabbits,c⁺ $\times$