An example of a trait that results from incomplete dominance is ________; a trait that results from codominant alleles is __________:
A) sickle-cell anemia; blood type
B) leukemia; breast cancer
C) heart disease; liver cancer
D) multiple sclerosis; Lou Gehrig's disease

Question

Quizplus · Accepted Answer

Incomplete dominance refers to a situation where the phenotype of a heterozygous individual is intermediate between the two homozygous individuals. Sickle-cell anemia is an example of incomplete dominance because individuals who are heterozygous for the sickle cell allele have some sickle-shaped red blood cells, but not as many as individuals who are homozygous for the sickle cell allele. Blood type, on the other hand, is an example of codominance because both alleles are expressed equally in the heterozygous individual, resulting in a new phenotype. For example, individuals with AB blood type have both A and B antigens on their red blood cells.

An Example of a Trait That Results from Incomplete Dominance