Chapter 4, Problem 11P

In the rats identified in Problem $\text{10}$, a third independently assorting gene involved in determination of coat colorin rats is the $\text{C}$ gene. At this locus, the genotype $\text{C–}$ permits expression of pigment from genes $\text{B}$ and $\text{D}$. The $\text{cc}$ genotype, however, prevents expression of coat color and results in albino rats. For each of the following crosses, determine the expected phenotype ratio of progeny.

a. $\text{BbDDCc×BbDdCc}$

b. $\text{BBDdcc×BbddCc}$

c. $\text{bbDDCc×BBddCc}$

d. $\text{BbDdCC×BbDdCC}$