Question

A couple has only A and O blood group
children in 3:1 ratio if father's blood group is
A, mohter's blood group is
1) O
2) A
3) A or O
4) B​

Answer 1

Answer:

And so is AB blood type. But someone who has a B and an O version only makes the B protein. They are B blood type but can pass the O onto their kids. So two B parents can make an O child if both parents are BO.

Explanation:

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