In pea plants, height is controlled by a single gene and the tall allele (T) is dominant

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Question:

In pea plants, height is controlled by a single gene and the tall allele (T) is dominant to the short allele (t). You find a tall pea plant in your yard and cross it with a short pea plant. It gives rise to 43 tall offspring and 35 short offspring. What is the genotype of the tall parent plant?

a. tt
b. TT
c. tT
d. Tt