Question

In complete dominance, the phenotype of the _____ allele is visible in a heterozygote, while the phenotype of the _____ allele is not visible in a heterozygote.

A) dominant, recessive
B) recessive, dominant
C) haplosufficient, haploinsufficient
D) loss of function, gain of function
E) both A and C are correct

Answer 1

In complete dominance, the dominant allele's phenotype is visible in a heterozygote, while the recessive allele's phenotype is not; thus, the answer is A) dominant, recessive.

Step-by-step explanation:

In complete dominance, the phenotype of the dominant allele is visible in a heterozygote, while the phenotype of the recessive allele is not visible in a heterozygote. The correct answer is A) dominant, recessive.

Recessive alleles are alleles that cause a phenotype that is only seen in homozygous genotypes and not in heterozygous genotypes. On the other hand, a dominant allele will mask the presence of a recessive allele in the heterozygous condition, making the phenotype of the dominant allele visible.

In scenarios such as incomplete dominance or codominance, the phenotypic patterns differ from complete dominance. Incomplete dominance results in a heterozygote expressing an intermediate phenotype between the homozygous phenotypes, whereas codominance results in the simultaneous expression of both alleles' phenotypes in the heterozygote.