Biology WAEC

Heterozygous tall plants were crossed with pure-breeding dwarf plants of the same species. What were the approximate percentages of the offspring?

A. 100% tall 0% dwarf
B. 75% tall 25% dwarf
C. 50% tall 50% dwarf
D. 25% tall 75% dwarf

Correct Answer: Option B

B. 75% tall 25% dwarf

Explanation

A heterozygous tall plant (say Tt) crossed with itself will give a set of TT, tT, Tt and tt. This is 75% tall and 25% dwarf approximately.

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