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In a monohybrid cross of plants with red...

In a monohybrid cross of plants with red and white flowered plants. Mendel got only red flowered plants. On self-pollinating these `F_(1)` plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represnt the genotype of plants of parental generation.

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RR and rr represents homozygous dominant and recessive form of parents.In `F_(1)` hybrid is represented In form of Rr.In `F_(2)` when selfing is done both R and r have the capacity to segregate representing the RR,Rr,Rr and rr types of genotype indicating `3:1` ratio.
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