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MHT CET Medical202626 April 2026Morning ShiftBiologyPrinciples of Inheritance and VariationActual

A cross between two plants resulted in the formation of tall and dwarf offsprings in the ratio of 3:1. The genotypes of their parents will be __________.

Options

  1. ATT and TT
  2. BTT and tt
  3. CTt and Tt
  4. Dtt and tt

Correct answer

C. Tt and Tt

Step-by-step solution

A phenotypic ratio of 3:1 for tall and dwarf offsprings is obtained in a monohybrid cross when both parents are heterozygous for the trait. Let the dominant allele for tallness be T and the recessive allele for dwarfness be t . When two heterozygous parents ( Tt ) are crossed ( Tt Tt ), the gametes produced by each parent are T and t . The resulting offspring genotypes are 1TT : 2Tt : 1tt . The corresponding phenotypes are 3 tall ( TT and Tt ) and 1 dwarf ( tt ). Thus, the genotypes of the parents must be Tt and Tt

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