In Mendel's pea plant experiments, in order for him to have observed a 3:1 phenotypic ratio in the F2 generation, which of the following must be true?
A) The pairs of alleles must be either homozygous dominant or homozygous recessive.
B) Both alleles of a pair must go into each gamete together.
C) Both of the F1 parents must be breed true.
D) The two alleles of a pair separate in gamete formation.
Answer: D
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