Principle of Inheritance and VariationMediumBloom L3
Question
Across between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
Options
A.TT and Tt
B.Tt and Tt
C.TT and TT
D.Tt and tt
Solution
Sol.(b) [Key Concept: Monohybrid Cross — Tall Plants Producing Dwarfs] For two TALL plants to produce SOME DWARF offspring, both parents must be HETEROZYGOUS (Tt × Tt). Cross: Tt × Tt → 1/4 TT (tall) : 2/4 Tt (tall) : 1/4 tt (dwarf). The 'few dwarf plants' corresponds to the 1/4 expected from the Mendelian 3:1 ratio. TT × TT or TT × Tt would not produce dwarfs; Tt × tt would produce 50% dwarfs (not 'few'). Only Tt × Tt produces the characteristic few (1/4) dwarf offspring.
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