Consider a recessive mutation that results in a complete loss of gene function. if heterozygous individuals (mutant/wild-type) are phenotypically wild-type, then the wild-type allele would be described as being see section 4.1 (page 107) .

dominant

Explanation:

In this example, if heterozygous individuals that carry one wild type allele and one mutant allele (mutant/wild-type) are phenotypically wild-type, then, the wild-type allele is dominant. This is explained by the fact that wild-type is expressed, even when mutant allele produces a non-functional gene.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.