Human geneticists assume that any allele that causes an abnormal phenotype is
A) dominant.
B) recessive.
C) pleiotropic.
D) rare.
E) common.

Question

Quizplus · Accepted Answer

Human geneticists often assume that any allele causing an abnormal phenotype is rare because most populations have undergone natural selection that tends to eliminate or reduce the frequency of alleles that cause harmful or disadvantageous traits.

Human Geneticists Assume That Any Allele That Causes an Abnormal