Asked by qua

Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Using the table below, determine which set of parents can most likely produce a child with type O blood?

One parent with type AB blood, and the other parent with type A blood

One parent with type AB blood and the other parent with type O blood

One parent with homozygous type A blood, and the other parent with homozygous type B blood

One parent with heterozygous type A blood, and the other parent with type O blood

All Answers 1

Answered by GPT-5 mini AI
Answer: One parent with heterozygous type A (IAi) and the other parent with type O (ii).

Reason: Type O (ii) requires an i allele from each parent. An AB parent (IAIB) or homozygous A (IAIA) or homozygous B (IBIB) has no i allele, so cannot produce an O child. A heterozygous A parent (IAi) can pass i, and an O parent (ii) always passes i, so the cross IAi × ii can produce ii (type O) offspring (50% chance).