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A man with Blood type A, whose mom had blood type O, marries a woman with blood type AB. What is the probability that they will have a child with blood type O?

2007-03-26 16:55:36 · 6 answers · asked by confused 1 in Science & Mathematics Biology

6 answers

Any person with blood type O (phenotype) must have the genotype OO, as O is recessive.

The man must have received an O allele from his mother, so his genotype must be AO (as you are told he has blood type A).

If you do the punnet square cross between AO and AB, you can see that it's not possible for any of their children to have blood type O.

2007-03-26 23:50:09 · answer #1 · answered by SteveK 5 · 0 0

They can't possibly have a type O child. You know that the man is type AO. If his mom was O, then she didn't possess the A or B alleles to pass on to her son. She had two O's. So he has to be AO. But it doesn't matter, because type O is recessive. The child will inherit either an A, or a B from his mother, so these would automatically be dominant, even if the father passed on his O. These are the possibilities for the child: AA, AO, AB, BO. That's it.

2007-03-27 01:21:01 · answer #2 · answered by Jennifer in CA 2 · 0 0

A_ X AB = will not give you an O

Even if the man is AO (from his mother), a cross with an AB woman will not produce an OO child.

Therefore P(child with blood type O) = 0

2007-03-27 00:05:44 · answer #3 · answered by iLumina 2 · 0 0

It doesn't matter what the man's blood type is, nor his mother. If the woman has blood type AB, she cannot have a child with blood type O. So this probability is zero.

2007-03-27 00:02:08 · answer #4 · answered by ecolink 7 · 0 0

0 %

2007-03-26 23:59:52 · answer #5 · answered by Robert Wilson 2 · 0 0

0%

2007-03-27 00:34:58 · answer #6 · answered by unknown_assasin03 2 · 0 0

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