Question

2. A woman of blood type A has children with a man of blood type AB. The woman's mother had blood type 0. What is the probability of a girl with blood type A? Show your work for full credit 1

Answer 1

If a women's mother had a blood type O, then the women must have atleast one O allele in her genotype,

So the genotype of the women should be AO while the genotype of the man is clearly AB.

So when you cross these, AO x AB,
the possible offsprings are AA, AB, AO and BO.

So the probability of a A blood type is 1/2 as AA and AO will both give A blood phenotype. The probability of having a girl as her children is also 1/2.

So the total probability should be 1/2 x 1/2 = 1/4.

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