AP BIOLOGY

Detailed explanation-1: -Genotype AA is the universally compatible genotype that is, regardless of who they partner up with, there is no possibility of them birthing a child with sickle cell disease. Here are the compatible and incompatible genotypes: AA + AA = compatible. AA + AS = compatible.

Detailed explanation-2: -An individual with the genotype Aa can make two types of gametes: A and a. Since this is a random process, the individual will, on average, make equal numbers of each gamete. (Frequency of 1/2 for each gamete). A second individual with genotype Aa can make two types of gametes: A and a.

Detailed explanation-3: -In real organisms genotypes can be either haploid or diploid. A haploid genotype contains a single set of instructions for constructing the phenotype. A diploid genotype contains two distinct sets of instructions, i.e., two sets of chromosomes each of which would be sufficient for constructing the phenotype.