To determine the number of genotypes and phenotypes, we perform a cross between the husband () and the wife ().

The gametes produced are:

• Husband: and
• Wife: and

The possible offspring genotypes from the cross () are:

1. (Phenotype: Blood Group A)
2. (Phenotype: Blood Group A)
3. (Phenotype: Blood Group AB)
4. (Phenotype: Blood Group B)

Analysis:

• Genotypes: There are 4 distinct genotypes ().
• Phenotypes: There are 3 distinct phenotypes (Blood Group A, Blood Group AB, and Blood Group B). Note that both and result in the same phenotype A due to the dominance of over .