Chapter 4, Problem 21P

A male and a female mouse are each from pure-breeding albino strains. They have a litter of $10$ pups, all of which have normal pigmentation. The ${\text{F}}_{\text{1}}$ pups are crossed to one another to produce ${\text{56 F}}_{\text{2}}$ mice, of which $\text{31}$ are normally pigmented and $\text{25}$ are albino.

a. Using clearly defined allele symbols of your own c hoosing, give the genotypes of parental and ${\text{F}}_{\text{1}}$ mice. What genetic phenomenon explains these parental and ${\text{F}}_{\text{1}}$ phenotypes?

b. What genetic phenomenon explains the ${\text{F}}_{\text{2}}$ results? Use your allelic symbols to explain the ${\text{F}}_{\text{2}}$ results.