What is the phenotypic ratio for the offspring of a homozygous individual (AA) and a heterozygous individual (Aa)?

To determine the phenotypic ratio of the offspring from a cross between a homozygous individual (AA) and a heterozygous individual (Aa), we start by looking at the possible genotypes of the offspring.

When the homozygous individual (AA) is crossed with the heterozygous individual (Aa), the possible gametes they can produce are:

• From the homozygous parent (AA): All gametes produced will possess the A allele.

• From the heterozygous parent (Aa): The gametes produced can either carry the A allele or the a allele.

This results in the following combinations in the offspring:

1. From AA and A (from Aa): AA

2. From AA and a (from Aa): Aa

Thus, the genotypes of the offspring will be:

• 50% AA

• 50% Aa

In terms of phenotype, since both genotypes (AA and Aa) express the dominant trait associated with the A allele, all offspring will show the dominant phenotype. Therefore, the phenotypic ratio of the offspring is 100% exhibiting the dominant trait, which can be expressed as a ratio of 4:0 if we consider four total offspring where all