Both members of a couple are carriers for a recessive disease allele. If the couple has four children, which of the following must be true?

Question

Quizplus · Accepted Answer

Both members of the couple are carriers for the recessive disease allele, which means each of their children has a 25% chance of inheriting two copies of the allele and developing the disease, a 50% chance of inheriting one copy of the allele and being a carrier like their parents, and a 25% chance of inheriting no copies of the allele. Therefore, it is possible that none of the children have the disease, but it is also possible that one, two, or even all of them could be carriers of the disease allele. So, option D is the correct answer as it is the only choice that is definitely true in all situations.

Both Members of a Couple Are Carriers for a Recessive