Essay
In rats,the gene for the pigment (P)is dominant to no pigment (p).The gene for black (B)is dominant to the gene for cream (b).If a pigment gene (P)is absent,genes B and b are inoperative.Predict the genotypes and phenotypes of the F2 of a parental cross between a homozygous black rat and an albino homozygous for cream.
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