Why are relatively few inherited disorders caused by two dominant alleles?
A)Because most disorders caused by dominant alleles lead to sterility which means the dominant allele will not be passed on.
B)Because genetic testing can more readily identify dominant rather than recessive alleles, genetic counseling has more successfully reduced the incidence of disorders caused by dominant alleles.
C)Because every person with one of the dominant alleles will have the disorder, and people with most of these disorders do not usually live long enough to reproduce, so the allele will not be passed on.
D)Because individuals carrying dominant alleles for a disorder are less likely to actually have the disorder than individuals carrying a recessive allele for a disorder.

Question

Quizplus · Accepted Answer

Disorders caused by two dominant alleles are relatively rare because individuals carrying one dominant allele will have the disorder, and people with most of these disorders do not usually live long enough to reproduce since they often have severe symptoms that lead to premature death. Therefore, the allele for the disorder will not be passed on as frequently as alleles causing recessive disorders.

Why Are Relatively Few Inherited Disorders Caused by Two Dominant