Which of the following is an example of epistasis? A fly with a dominant allele

Question

Which of the following is an example of epistasis? A fly with a dominant allele at the S gene has short wings, and a fly with a dominant allele at the W gene has light body color. However, a fly with dominant alleles at both the S gene and the S gene has short wings and light body color. A cat with two dominant alleles at the H gene has short hair, and a cat with two recessive alleles at the H gene has long hair. However, a cat with a dominant allele and a recessive allele at the H gene has short hair. A person with two copies of the I^A allele at the ABO gene has blood type A, and a person with two copies of the I^B allele at the ABO gene has blood type B. However, a person with the genotype I^AI^B has the blood type AB. A dog with a dominant allele at the S gene is brown, and a dog with a dominant allele at the B gene and the S gene is black. However, a dog with two recessive alleles for the S gene and any genotype at the B gene is yellow.

Explanation / Answer

C) A person with two copies of the IA allele at the ABO gene has bloblood type A, and a person with two copies of the IB allele ABO gene has blood type B. However, a person with the genotype IAIB has the blood type AB.

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