Question

What is the allele in a heterozygote that has no effect on the phenotype?A) Dominant alleleB) Recessive alleleC) Deleterious alleleD) Dominant trait

Answer 1

The allele that has no effect when a genotype is a heterozygote, and hence does not affect the phenotype, is a recessive allele. This leads us to consider that only when the two inherited alleles are recessives, the particular condition related to those alleles will be expressed in the phenotype.

Only when two recessive alleles are present, the associated trait to them are expressed. The answer then is B, recessive allele.