Question

In humans blood type alleles are codominant and the allele o is recessive. What is the probability that a couple that are type O and type Ao will have a child that is type A?

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25%
0%
50%
75%
100%

Answer 1

Expert Verified Answer

Step-by-step explanation:

The probability that a couple that are type O (homozygous recessive, oo) and type Ao (heterozygous, Ao) will have a child that is type A (homozygous dominant, AA) is 0%.

Both the Type O parent (oo) and the Type Ao parent (Ao) are carriers of the A allele, but neither parent has the AA genotype that would produce a Type A child. The Type O parent can only pass along the o allele and the Type Ao parent can pass along either the A or the o allele. Since neither parent has the AA genotype, it is not possible for them to produce a Type A child.