The Individuals Mendel Observed in the F₁ Generations Were Always

Question

The individuals Mendel observed in the F₁ generations were always
A)homozygous recessive.
B)homozygous dominant.
C)heterozygous.
D)codominant.

Accepted Answer

Mendel always started with two true-breeding (homozygous) parents that differed in a single trait (e.g. one with round seeds, one with wrinkled seeds). The F₁ (first filial) generation resulted from crossing these two parents and always produced heterozygous offspring (e.g. all with round seeds). Therefore, the individuals Mendel observed in the F₁ generation were always heterozygous.