The two alleles that result in the expressed phenotype for hemoglobin are equally expressed. This is an example of:
A) polymorphism.
B) codominance.
C) pleiotropy.
D) Mendelian inheritance.

Question

Quizplus · Accepted Answer

Codominance occurs when both alleles in a heterozygous individual are expressed equally and can be observed in the phenotype. This is different from incomplete dominance, where a blending of traits occurs in the heterozygote. Polymorphism refers to the presence of multiple forms of a gene or DNA sequence in a population. Pleiotropy refers to the effect of one gene on multiple traits. Mendelian inheritance refers to the principles of inheritance proposed by Gregor Mendel, including the law of segregation and the law of independent assortment. While hemoglobin expression does follow these rules, the specific example given in the question is best described as codominance.

The Two Alleles That Result in the Expressed Phenotype for Hemoglobin