Which of the Following Is an Example of Nonadditive Genetic

Which of the following is an example of nonadditive genetic variance?

A) Even though MZ twins have all their genes in common and DZ twins have about half of their genes in common, MZ twins may be over twice as similar to each other as DZ twins are
B) The effects of genetics, non-shared environments, and shared environments may not add up to 100%
C) Adoptive siblings tend to be less like each other than are biologically related siblings
D) MZ twins raised together are less like each other than MZ twins raised apart