Coat color in rabbits is under the control of a single gene with four alleles: c (full gray color); cch (chinchilla, light gray); ch (himalayan, white with black extremities); and c (albino, absence of pigmentation). the dominance hierarchy is represented as: c > cch > ch > c.
a. how many different genotypes are possible for a rabbit with full gray color?
b. what genotypic and phenotypic ratios are expected in the offspring of the following cross: cc × cchch?
c. a rabbit breeder bought a fine chinchilla buck (male) from a colleague. however, he suspects that it may not be a true-breeder. what crosses can he perform to eliminate this uncertainty?
d. the rabbit breeder mates the chinchilla buck with a homozygous himalayan doe (female), and obtains a litter of six baby (kit) rabbits, all chinchilla. based on this result, how sure (in %) would the breeder be that the buck is homozygous at the color locus?