Why Did All of the F₁ Offspring of Mendel's Classic

Multiple Choice

Why did all of the F₁ offspring of Mendel's classic pea cross always look like one of the two parental varieties?

A) No genes interacted to produce the parental phenotype.
B) Each allele affected phenotypic expression.
C) The traits blended together during fertilization.
D) One allele was dominant.