two parents both of blood group A have a daughter of blood group O .what is the probability that their next child will be a boy who has blood group O?....
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Answer:
These two parents, both group A, have a female child of blood group O.
Since the instructor asking his students this question is almost certainly teaching at a level that discounts mutations, rare combinations and recombinations, I will also answer at that level.
The first thing we are told is that the parents are type A, but we don't know if they are homozygous (A/A) or heterozygous (O/A). All we know is that they have at least one A gene each.
The second thing we learn is the first child is female.
The third thing is that she has type O blood.
We can conclude that, since she has type O, each parent must be heterozygous (O/A), because both the A and B genes are dominant over O, and so she must have received an O from each parent, and be O/O herself. As usual, a Punnett square makes this....
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Answer:It is given that two parents have blood group A and have a daughter of blood group O. probability of boy with blood group O will be 100 percent