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. which set of parents can most likely produce a child with type o blood? a. one parent with type ab blood, and the other parent with type a blood b. one parent with type ab blood and the other parent with type o blood c. one parent with heterozygous type a blood, and the other parent with type o blood d. one parent with homozygous type a blood, and the other parent with homozygous type b blood a a

The correct answer is: C. one parent with heterozygous type A blood, and the other parent with type O blood

If we name the gene for blood type with I, possible genotypes would be:

IAIA and IAIi for the A blood type

IBIB and IBIi for the B blood type

for the O blood type

IAIB for the AB blood type.

If there is one parent with heterozygous type A blood, and the other parent with type O blood:

P: IAIi  x  

F1: IAIi IAIi  

There is 50% chance that the child will have O blood type.

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