Blood Samples Are Taken from the Heel of Newborn Babies

Multiple Choice

Blood samples are taken from the heel of newborn babies to test for a mutation in the PKU gene, which, if left untreated and in severe cases, can lead to mental retardation, reduced skin pigmentation, and seizures. Which concept is being illustrated by this example?

A) incomplete dominance
B) polygenic inheritance
C) pleiotropy
D) codominance