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A man who is heterozygous for type A blood has children with a woman who has type O blood. What is the probability they will have a child with type A blood?Group of answer choices0%75%25%50%100%

Question

A man who is heterozygous for type A blood has children with a woman who has type O blood. What is the probability they will have a child with type A blood?Group of answer choices0%75%25%50%100%

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Solution

The man's genotype for blood type is AO (since he is heterozygous for type A blood). The woman's genotype is OO (since she has type O blood).

When you cross these genotypes, you get the following possibilities for their children's genotypes: AO, AO, OO, OO.

So, the probability of having a child with type A blood (genotype AO) is 2 out of 4, or 50%.

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At one gene locus in humans there are 2 alleles: one for curly hair and another for straight hair. Neither allele is dominant, and heterozygous individuals have wavy hair. At a second gene locus, 3 alleles control ABO blood type. The alleles at these 2 gene loci assort independently. A man with straight hair and A blood has children with a woman with wavy hair and B blood. Their first child has straight hair and O blood. If their second child is a boy with straight hair, what is the probability that he has A blood? (Express your answer as a percentage. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5.)

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