A man has blood type O, Rh negative. These are both recessive traits. He is married to a woman who has blood type A, Rh positive. These are both dominant traits. Blood type and Rh factor are not linked genes. This couple has 3 children, two type A, Rh positive and one type A, Rh negative. What is the mother's most likely genotype? A) IAIARR B) IAIARr C) IAIORr D) IAIArr

Mother genotype is IAi (heterozygous)

Explanation:

Man is Rh negative and O type blood group its genotype is OrOr

Mother is A positive so her genotype would be either IAIA or IAi

Also A blood group is dominant over O blood group.

It is given:

two children are A POSITIVE

One child is A negative

so the mother must have been heterozygous with genotype IAi as one of the child would have recieved it from mother as it is a dominant trait.

Punnete square shows

       AI   Ai

i     AIi   Aii

i     AIi   Aii    50 percent chances of A negative child is there.

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