The black color of the coat in the guinea pig dominates over the white. A heterozygous black female

The black color of the coat in the guinea pig dominates over the white. A heterozygous black female was crossed with the same male. To determine what the offspring will be by genotype and phenotype.

A – black coat color (dominant).

a – white coat color (recessive).

Parents are heterozygous.

P ♀ A a x ♂A a,

G A, a     A, a.

F1 A A, A a, A a, a a.

Splitting according to the phenotype is 3: 1, that is, 3/4 of the hybrids will be with black color of six, 1/4 – with white color of the coat.

Splitting by genotype is 1: 2: 1.