Question

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

Explanation:

In genetics (a subfield of Biology, which is part of Natural Science), a heterozygous genotype has one dominant and one recessive allele. The dominant allele masks the recessive one, so the heterozygous genotype shows the dominant trait. The blank should be filled with "dominant" as the allele that is expressed (covers the recessive) in heterozygous.

Answer:

dominant