Question

A man who is blood group o married a woman who has blood group A.what is the probability of their first child to have blood group o if both parents are homozygous​

Answer 1

For the USA, O phenotype makes up about 44% of the population. Making it about 66.5% of the alleles. The A frequency is harder to estimate because of mixed phenotypes, but must be < 20%.

So it would be at least 75% likely your first child would be OO. (66:20)

Answer 2

Answer:

That’s a 2 part question.

If a woman is blood type A, she can be AA or AO, what are the relative rates.

If AA, your first child must be A. If AO, then it’s 50:50 A or O.

For #1, the answer will vary based on ethnic groups.

For the USA, O phenotype makes up about 44% of the population. Making it about 66.5% of the alleles. The A frequency is harder to estimate because of mixed phenotypes, but must be < 20%.

So it would be at least 75% likely your first child would be OO. (66:20)