Question

Q. With the help of cross done with Garden pea plant trace the work done by Mendel with a tall and short plant to arrive at 3:1 in the F2.​

Answer 1

Explanation:

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Answer 2

F2 generation is the result of cross between offspring of first filial or F1 generation. The punnet square gave the phenotype ration of 3:1 i.e. 3 tall and one short pea plant in F2 generation.

Explanation:

Mendel crossed homozygous short and tall plants of garden pea respectively in the parental generation to have F1 generation. He observed heterozygous dominant traits in the garden pea plant.

Gametes of parents tall TT and short tt

F1 generation will be shown in monohybrid cross in the Punnet square:

    T    T

t    Tt  Tt      All the progeny are tall and heterozygous.

t   Tt   Tt

He then interbred the progeny of F1 generation to get F2 generation. The gametes are Tt and Tt

The punnet square:

  T    t

T TT Tt

t  Tt  tt       3:1 is the phenotype ratio in F2 generation.

                 1:2:1 is the genotype ratio in F2 generation.

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