Two people with Huntington disease,an autosomal dominant disorder,have a son.What are the chances he will get the disease? (Draw a Punnett square to help you determine the answer. )

Question

Quizplus · Accepted Answer

Huntington's disease is caused by a dominant allele, which means that if one parent has the disease, there is a 50% chance that each child will inherit the disease-causing allele. In this case, both parents have the disease, so they would both be heterozygous (Hh). Using a Punnett square with Hh x Hh, there is a 75% chance (or 3 out of 4) that the child will inherit at least one H allele and therefore develop the disease.

Two People with Huntington Disease,an Autosomal Dominant Disorder,have a Son