A man who is heterozygous for type A blood has children with a woman who is heterozygous for type B blood. What is the probability they will have a child with type A blood?Group of answer choices25%100%75%50%0%
Question
A man who is heterozygous for type A blood has children with a woman who is heterozygous for type B blood. What is the probability they will have a child with type A blood?Group of answer choices25%100%75%50%0%
Solution
To answer this question, we need to understand the genetics of blood types.
Blood type is determined by two alleles. Each parent gives one allele to their child. The alleles for blood types are A, B, and O. A and B are co-dominant (meaning if you get an A from one parent and a B from the other, you have type AB blood), and O is recessive.
The man is heterozygous for type A blood, which means he has one A allele and one O allele (AO). The woman is heterozygous for type B blood, which means she has one B allele and one O allele (BO).
The possible combinations for their children are:
- AO (Type A blood) from getting an A from the father and an O from the mother.
- AB (Type AB blood) from getting an A from the father and a B from the mother.
- BO (Type B blood) from getting an O from the father and a B from the mother.
- OO (Type O blood) from getting an O from both parents.
So, out of 4 possibilities, 1 results in a child with type A blood. Therefore, the probability is 25%.
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