In the offspring from crossing the gray Drosophila with the black one, the same number of black and gray Drosophila

In the offspring from crossing the gray Drosophila with the black one, the same number of black and gray Drosophila was obtained.
a) What are the genotypes of parents and offspring?
b) What are the genotypes of parents and offspring if 280 black and 920 gray fruit flies were obtained?

a) parents Aa, aa, offspring Aa, aa (1: 1);
b) parents AA, AA, offspring AA: 2Aa: aa (1: 2: 1).

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