Question

a person with ab blood illustrates the principle of

1. incomplete dominance.
2. codominance.
3. pleiotropy.
4. epistasis

Explanation:

Codominance is a situation where both alleles in a heterozygote are fully expressed. In the case of blood types, a person with AB blood has both the A and B alleles expressed. Incomplete dominance is when the heterozygote has an intermediate phenotype. Pleiotropy is when one gene affects multiple traits. Epistasis is when one gene masks the expression of another gene.

Answer:

1. codominance.