Thalidomide Was a Common Treatment for Morning Sickness in the 1950s.Children

Multiple Choice

Thalidomide was a common treatment for morning sickness in the 1950s.Children born to mothers given this drug showed the phenotypes of a genetic disease known as phocomelia,which involves shortened limbs.This may represent

A) incomplete dominance.
B) genetic heterogeneity.
C) penetrance.
D) phenocopy.
E) incomplete penetrance.