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In a monohybrid cross of plants with red and white-flowered plants, Mendel got only red-flowered plants. On self-pollinating these F1 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 the parental generation.

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The usage of particular alphabets is only meant for convenience. Generally, the character is shown by the first letter of a particular trait, and a different case of the same letter is used to show the contrasting character. Conventionally, a capital letter depicts the dominant trait, and the lower case letter depicts the recessive trait.

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