What are the genotypes of predicted homozygous offspring?

The genotypes of a homozygous offspring are "AA" and "aa".

Explanation:

When we say that an individual is homozygous for a particular trait, we are saying that he has in his genotype two equal alleles for that trait. Since each cell has two equal alleles, all gametes of a homozygous individual are equal.

Considering, for example, the allele "A" to indicate melanin production in humans and the allele "a" to indicate lack of production, we can represent homozygous individuals as AA or aa. This means that we have recessive homozygotes (aa) and dominant homozygotes (AA). In this case the dominant homozygotes are capable of producing melanin while the recessive ones are albino.