Question

How is it possible for a person to have blood type AB?

The alleles for blood types A and B are codominant.

Blood type is controlled by many genes.

The gene for blood type has multiple alleles.

The alleles for blood types A and B are recessive.

Answer 1

[AI-generated answer — Bot GPT 3.5]

In the case of blood type AB, an individual has inherited one allele for blood type A and one allele for blood type B from their parents. These alleles are codominant, meaning that they both contribute to the blood type phenotype in an equal and dominant manner. This results in the individual having a blood type that expresses characteristics of both types A and B.