Humans have an MN gene that codes for a red blood cell antigen.The gene has two alleles,M and N.When the two alleles are inherited together,MN,both are expressed.This is an example of
A) codominance.
B) incomplete dominance.
C) complete dominance.
D) X-linked inheritance.
E) base-pair substitution.

Question

Quizplus · Accepted Answer

Codominance occurs when both alleles in a heterozygous individual are expressed equally and fully, resulting in a phenotype that displays characteristics of both alleles. In this case, individuals with the MN genotype express both the M and N antigens on their red blood cells, indicating codominance. Incomplete dominance would result in a blending of the traits, while complete dominance would result in only one allele being expressed. X-linked inheritance would involve genes located on the X chromosome, and base-pair substitution refers to a type of mutation, which is not applicable in this scenario.

Humans Have an MN Gene That Codes for a Red