If a man with type O blood (genotype ii) marries a woman with heterozygous type A blood (genotype IA i), what are the possible blood types of their offspring?
Answer and explanation
Correct answer: A. 50% type A and 50% type O
- Step 1: Cross: ii x IA i. Step 2. Gametes: i from father, IA or i from mother. Step 3. Offspring: 50% IA i (type A) and 50% ii (type O). Answer: 50% type A and 50% type O. Why not the others: Mother carries the recessive allele i, yielding equal chances of A and O.
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