In Rats, the P Gene Allele for Pigmentation (P) Is

Multiple Choice

In rats, the P gene allele for pigmentation (P) is dominant to the allele for albinism (p) . The B gene allele for black pigmentation (B) is dominant to the allele for cream pigmentation (b) . The pp homozygous recessive genotype is epistatic to any allele combination at gene B.
-Predict the phenotypic ratio of the F₂ progeny of a parental cross between a pure-breeding black rat and an albino that is also homozygous for cream.

A) 1 black: 2 cream: 1 albino
B) 9 black: 3 cream: 4 albino
C) 9 black: 7 albino
D) 12 black: 3 cream: 1 albino
E) 15 black: 1 albino