If a child has an AB blood type,the parents
A) must both have different blood types.
B) must be A and B, but not AB.
C) must be AB.
D) can be any blood type.
E) can have different blood types, but neither can be O.

Question

Quizplus · Accepted Answer

A child with AB blood type must have inherited an A allele from one parent and a B allele from the other parent. This means that the parents must have at least one A or B allele each, but neither can be O (which does not have A or B alleles). Therefore, the parents can have different blood types, but neither can be O. Choice A and B are incorrect because both parents do not need to have different blood types or specific A and B blood types. Choice C is incorrect because if both parents were AB, they would only pass on AB alleles to their child, resulting in an AB blood type. Choice D is incorrect because if one parent had O blood type, they would not be able to contribute an A or B allele to their child, resulting in an A or B blood type instead of AB.

If a Child Has an AB Blood Type,the Parents