In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (pp). Explain the inheritance pattern of F1 and F2 generations with the help of a cross following the rules of inheritance of traits. State the visible characters of F1and F2 progenies.
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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