Biology Practice Problems Extensions to Mendel Practice Problems Solution: A, B, ad O blood type in humans is controlled by a...

Solution: A, B, ad O blood type in humans is controlled by a single gene with three alleles: IA (or A), IB (orB), and i (or O). Type O is the recessive trait. The i (O) allele is recessive to both IA (or A), and IB (orB). Which of the following could be possible genotypes of the parents ofa person with type O blood?A. IAi (AO) and IAIA (AA)B. IAi (AO) and IBi (BO)C. IAIB (AB) and IAi (AO)D. IAIB (AB) and ii (OO)E. All of the above are possible

Problem

A, B, ad O blood type in humans is controlled by a single gene with three alleles: IA (or A), IB (orB), and i (or O). Type O is the recessive trait. The i (O) allele is recessive to both IA (or A), and IB (orB). Which of the following could be possible genotypes of the parents ofa person with type O blood?

A. IAi (AO) and IAIA (AA)

B. IAi (AO) and IBi (BO)

C. IAIB (AB) and IAi (AO)

D. IAIB (AB) and ii (OO)

E. All of the above are possible

Solution

As stated, the alleles A and B are codominant to allele O. This means that the individual will not have the O blood type when it is accompanied by the other alleles. But also, since this is a recessive allele, a pair  could have an offspring with the blood type O even if none of these individuals have it.

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