In the Bombay phenotype, a gene in the recessive condition blocks the expression of A and B red blood cell antigens. Thus, all A, B, and AB genotypes are expressed as the O phenotype. This is an example of ____.
A) complete dominance
B) polygeny
C) incomplete dominance
D) codominance
E) pleiotropy

Question

Quizplus · Accepted Answer

The Bombay phenotype is an example of epistasis, where one gene (in recessive form) masks the expression of other genes, leading to the O phenotype regardless of the presence of A or B alleles. Polygeny is the closest term related to multiple genes affecting a trait, but epistasis is the more precise term for this specific interaction.

In the Bombay Phenotype, a Gene in the Recessive Condition