Tall Pea Plants Are Crossed to Short, and the Progeny

question 70

Multiple Choice

Tall pea plants are crossed to short, and the progeny are medium height. The F₁ plants are crossed together, but the progeny observed among the F₂ have nine different size classes. This result is best explained by

• A) the existence of pleiotropic alleles.
• B) incomplete dominance.
• C) codominance.
• D) an increased number of phenotypes due to multiple alleles.
• E) epistasis.

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