Mendel Found That Pea Plants Expressing a Recessive Trait

Multiple Choice

Mendel found that pea plants expressing a recessive trait

A) were pure-breeding.
B) appeared only in the first generation of a cross between two pure-breeding plants expressing contrasting forms of a trait.
C) disappeared after the second generation.
D) could be produced only if one of the parents expressed the recessive trait.
E) were none of these.