What Is the Expected Outcome of Any Pregnancy or Child

Multiple Choice

What is the expected outcome of any pregnancy or child produced by two parents who are each heterozygous for the Huntington disease allele?

A) The couple cannot produce children who are unaffected.
B) Homozygous offspring will express the disease in childhood instead of as an adult.
C) A child who is homozygous for the mutated alleles is not likely to transmit the disorder to his or her children.
D) Because of the possibility of incomplete or low penetrance, an unaffected offspring could have an affected child.