Harmful Dominant Alleles, Like Those for the Huntingtin Gene, Are

Multiple Choice

Harmful dominant alleles, like those for the huntingtin gene, are not common because in most cases

A) the brain does not make very many of them.
B) the carrier can only pass on the allele to another dominant carrier.
C) the body tends to suppress the action of dominant genes until adulthood.
D) the carrier does not survive long enough to pass on the allele via reproduction.