In mice, gray color (A) dominates over black (a). When crossing gray and black mice, half of the born mice were black

In mice, gray color (A) dominates over black (a). When crossing gray and black mice, half of the born mice were black, half – gray. What are the genotypes of parents?

gene trait
A     gray
a      black
——————————
DECISION
R aa x aa
G A a a
F1 aa aa
sir chern
50% 50%

Answer: parental genotypes (Aa is heterozygous, aa is homozygous for a recessive trait).

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