With Respect to Autosomal Dominant Inheritance in Human Genetics, Which

Multiple Choice

With respect to autosomal dominant inheritance in human genetics, which, if any, of the following statements is incorrect?

A) One of the parents of an affected person will be affected.
B) Both parents of an affected person may be unaffected, but one of them at least will carry the mutant allele in all of their nucleated cells.
C) A child born to an affected parent and a normal parent has a 50% chance of inheriting the mutant allele.
D) The term dominant applies equally to the phenotype of affected individuals with one mutant allele (heterozygotes) and individuals with two mutant alleles because in practice the phenotypes are essentially identical.