In rabbits, an allelic series helps to determine coat color: C (full color), c^ch (chinchilla; gray color), c^h (Himalayan; white with black extremities), and c (albino; all white).The C allele is dominant to all others, c^ch is dominant to c^h and c, c^h is dominant to c, and c is recessive to all the other alleles.This dominance hierarchy can be summarized as C c^ch c^h c.Indicate the phenotypic ratios expected in rabbits with the cross Cc^h × cc.

Question

In rabbits, an allelic series helps to determine coat color: C (full color), c^ch (chinchilla; gray color), c^h (Himalayan; white with black extremities), and c (albino; all white).The C allele is dominant to all others, c^ch is dominant to c^h and c, c^h is dominant to c, and c is recessive to all the other alleles.This dominance hierarchy can be summarized as C > c^ch> c^h> c.Indicate the phenotypic ratios expected in rabbits with the cross Cc^h × cc.

Quizplus · Accepted Answer

1 full color:1 HimalayanIn this cross, the C allele (full color) is dominant over all other alleles, and the c^h allele (Himalayan) is dominant over the c allele (albino) but recessive to both C and c^ch (chinchilla). Since one parent is Cc^h (carrying alleles for full color and Himalayan) and the other is cc (homozygous for albino), the offspring can either inherit a C allele from the first parent and a c allele from the second (resulting in a full color phenotype due to the dominance of C) or inherit the c^h allele from the first parent and a c allele from the second (resulting in a Himalayan phenotype due to the dominance of c^h over c). This results in a 1:1 phenotypic ratio of full color to Himalayan rabbits.

In Rabbits, an Allelic Series Helps to Determine Coat Color