The reason that the HD allele acts as a dominant allele is that
A)the HD mutation results in a protein that can damage nerve cells even in the presence of the normal protein.
B)the normal HD allele does not normally produce a protein but the mutant HD allele does.
C)the mutant HD allele suppresses protein production from the normal HD allele.
D)the protein produced from the mutant HD allele is nonfunctional.

Question

Quizplus · Accepted Answer

The HD mutation leads to the production of a protein that is harmful to nerve cells, even when the normal version of the protein is present. This toxic effect of the mutant protein is what causes Huntington's disease to follow a dominant inheritance pattern, where only one copy of the mutant allele is needed to produce the disease phenotype.

The Reason That the HD Allele Acts as a Dominant