Question

The pedigree above shows a cross between an affected female and unaffected male for Huntington's disease. Huntington's disease is autosomal dominant. If both parents have Huntington's disease, what are the chances that they will have children who do NOT have the disease?

Answer 1

Answer:

there is a 25% chance that the parents (both Hh) will have a child that does not have the disease

Explanation:

This would be the dichotomous key:

| H | h

H | HH | Hh

h | Hh | hh