One Reason That the Effects of Individual Genes on Complex

Multiple Choice

One reason that the effects of individual genes on complex traits can be difficult to determine is that:

A) environmental effects cannot be measured.
B) environmental effects are so large that genetic effects cannot be measured.
C) a single phenotype may be produced by many different genotypes.
D) neither environmental nor genetic effects can be measured.
E) genetic effects cannot be measured, regardless of the effects of the environment.