Question

a heterozygous genotype will only show the dominant trait, because a dominant allele always covers or masks a dominant allele. a heterozygous genotype is (need a refresher? watch this video on heterozygous and homozygous) aa aa aa

Explanation:

A heterozygous genotype has two different alleles (one dominant, one recessive). Among the options: "AA" is homozygous dominant, "Aa" has one dominant (A) and one recessive (a) allele (heterozygous), and "aa" is homozygous recessive. So the heterozygous genotype is Aa.

Answer:

Aa