In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

Question

O only
A or B only
A, B, or O only
A, B, AB, or O

Answer 1

To determine the possible blood phenotypes of the offspring produced by an individual with the AO genotype and an individual with the BO genotype, we can outline the genotypes of the parents and their possible allele contributions to the offspring.

Parent Genotypes:

• Parent 1 (AO) can contribute either A or O allele.
• Parent 2 (BO) can contribute either B or O allele.

Possible Allele Combinations:

1. A from Parent 1 and B from Parent 2 = AB
2. A from Parent 1 and O from Parent 2 = AO (phenotype A)
3. O from Parent 1 and B from Parent 2 = BO (phenotype B)
4. O from Parent 1 and O from Parent 2 = OO (phenotype O)

Thus, the possible phenotypes for their offspring can be:

• Phenotype A (from AO)
• Phenotype B (from BO)
• Phenotype AB (from AB)
• Phenotype O (from OO)

So, the answer is that the offspring can have phenotypes of A, B, AB, or O.

Final Answer: A, B, AB, or O