In garden peas, the allele for tall plants is dominant over the allele for short plants.Suppose that a true-breeding tall plant is crossed with a short plant, and one of their offspring is crossed with a short plant.Out of 20 offspring resulting from the cross, about _______ should be tall.

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A true-breeding tall plant (TT) crossed with a short plant (tt) would produce all Tt (heterozygous tall) offspring. Crossing a Tt plant with a tt plant would result in a 1:1 ratio of tall (Tt) to short (tt) offspring. Therefore, out of 20 offspring, approximately 10 should be tall.

In Garden Peas, the Allele for Tall Plants Is Dominant