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B. The first generation will not have short plants. The short trait will return in the second generation.

Explanation:

If T is for Tall and t is for short, then the first generation doesn't have any short offspring. We can rule out answer choices A and D.

The second generation results in TT, Tt, Tt, tt.

TT is a tall Offspring.

Tt is a Tall Offspring, with a small t as a recessive trait.

tt is a short offspring because both the recessive traits (t) are together.

We can rule out option C.

That leaves us with the correct answer being B. The first generation will not have short offspring, but will pass it on to the second generation, which will have a short offspring (25% chance of having short offspring).