Mendel's Principle of Segregation states that the alleles of a gene will separate from one another during the formation of gametes. Consider the genotype Aa. How many different types of gametes will this individual produce?

Two

Explanation:

When alleles pass through segregation hey get ripped apart from it's homologous to produce mono allele gametes.

To create a new organism, that mono allele gamete will associate with another mono allele gamete to greate a full cell.

In this case, if your complete cell has both alleles A, and a.

Could produce two single allele cells A or a.