A man with a blood genotype IAi marries a woman with a blood genotype IAi. What phenotypes could be expected in their children? 1. Both type A and type O 2. Type O only 3. Type A only 4.Type B only

1. Both type A and type O

Explanation:

Blood genotype in humans follow the ABO system. The allele iA (type A) and iB (type B) are co-dominant but both dominant over the allele i (type O). This means that only a human with two i alleles will be type O.

Type A - iAiA or iAi (heterozygous)

Type B - iBiB or iBi (heterozygous)

Type O - ii

In this question, a man with a blood genotype IAi (type A) marries a woman with a blood genotype IAi (type A). Each of the parents will produce a gametes iA and i. Using these gametes in a punnet square (see attached image), offsprings with the following genotype will be produced: iAiA, iAi, and ii.

iAiA and iAi are type A while ii is type O. This means that both type A and type O could be expected in the children of this cross.

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