Q. 204.2( 34 Votes )

In a pea plant, t

Answer :

The cross is studied by monohybrid cross since it is involving only one trait which is the flower colour.

During the F1 generation:

Gametes: P and p

(PP X pp)


So, during F1 generation, the progenies are all of genotype: Pp or heterozygous purple flowers and are all purple flowers (phenotype similar).

Phenotypic Ratio =1:1

Genotypic Ratio=1:1

The white colour trait has been suppressed by the dominant trait colour, purple.

Upon further crossing this F1 progeny with each other,

Gametes: P and p

F2 generation:

Phenotypic Ratio = 3:1 (3 Purple flowers and 1 White flower)

Genotypic Ratio = 1:2:1 (1 Homozygous Purple, 2 Heterozygous Purple and 1 Homozygous White flower)

(From the Punnett square it is easily seen that 1/4th of the random fertilisation lead to PP, 1/2 lead to Pp and 1/4th to pp).

In F2 progeny, three plants have purple flowers and one plant has white flower.

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