WAEC Biology 2022 Objective — Question 45

Question 45 of 50 from the West African Examinations Council (WAEC) Biology 2022 Objective paper, with the correct answer and a full explanation.

Two tall plants were crossed and all the F₁ plants were tall. When the F₁ plants were selfed, some of the F₂ plants were tall while others were short. What are the possible genotypes of the original tall plants?

A. Tt and tt
B. TT and TT
C. tt and tt
D. TT and TtCorrect

Explanation

Since all F₁ are tall (dominant trait) and F₂ shows segregation (tall and short), one tall parent must be homozygous dominant (TT) and cross partner genotype consistent with producing the observed F1/F2 ratio; per the source's answer, the possible genotypes are TT and Tt.

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