In a cross, 45 tall and 14 dwarf plants were obtained, the genotype of parents was ________.

TT X TT

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TT X Tt

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Tt X Tt

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TT X tt

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Solution

The correct option is D Tt X Tt
In the given question, the ratio of tall (45) to dwarf plants (14) reduces to 3: 1. This proportion of tall to dwarf plant can be obtained only when two tall heterozygotes are crossed. This can be shown as under:
P generation: Tt X Tt
F $_{1}$ generation: TT Tt Tt tt
(tall) (tall) (tall) (dwarf)
Tall : Dwarf = 3:1

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