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UPCAT Science practice question 6: A homozygous tall pea plant (TT) is crossed with a homozygous short plant (tt). What fraction of the F1 generation will be tall, given that T is completely dominant?

Correct answer

A. All of them

Every offspring receives T from one parent and t from the other, so all are Tt and all express the dominant tall phenotype.

A homozygous tall pea plant (TT) is crossed with a homozygous short plant (tt). What fraction of the F1 generation will be tall, given that T is completely dominant?

  1. All of themCorrect
  2. None
  3. One half
  4. Three quarters

Why A is correct

Every offspring receives T from one parent and t from the other, so all are Tt and all express the dominant tall phenotype.

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