When gray mice were crossed with whites, gray offspring were obtained, what is the ratio

When gray mice were crossed with whites, gray offspring were obtained, what is the ratio of the three genotypes and the nature of inheritance.

1) From the conditions of the problem, it can be concluded that gray color dominates over white, because only it appears in the offspring.
A – gray wool,

a – white wool.

2) There is no phenotype cleavage in the offspring of the first generation. It follows that each of the parents was homozygous for their own trait.

3) Crossing scheme:

Parents: AA x aa,

Gametes: Ax a,

Offspring: Aa.

All offspring are heterozygous.

4) The type of inheritance is complete domination.