In rats, the allele for pigmentation (P) is dominant to the allele for albinism (p). The gene for black pigmentation (B) is dominant to the gene for cream pigmentation (b). If the dominant P allele is absent, gene B is inoperative. What is the expected phenotypic ratio of the offspring from a cross of an albino rat heterozygous for black to a cream rat heterozygous for pigmentation?

Question 12 options:

1 albino : 2 black : 1 cream

9 black : 3 albino : 4 cream

1 albino : 2 cream : 1 black

1 black : 2 albino : 1 cream