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)


F1:



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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