In a monohybrid cross of plants with red and white flowered plants. Mendel got only red flowered plants. On self-pollination 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 represent the genotype of plants of parental generation.

Question

In a monohybrid cross of plants with red and white flowered plants. Mendel got only red flowered plants. On self-pollination 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 represent the genotype of plants of parental generation.,

MARKS App · Accepted Answer

For dominant trait and for recessive traits lower case of the same gene are used (alleles). Experiment proves that it is a monohybrid cross which shows 3 : 1 ratio in F 2 ​ -generation. Upper case letters are used as symbols. This shows parents must be true-breeds. As parents are diploid and homologous chromosomes that carry alleles with similar type, which are represented by RR and rr.

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