What is the ratio of progeny, when a red-flowered heterozygous plant is crossed with a white-flowered plant, in which red flower is dominant to white flower?

3 : 1

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1 : 1

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1 : 2 : 1

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9 : 3 : 3 : 1

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Solution

The correct option is B 1 : 1
Consider that the allele for a red flower is R (being the dominant allele) and that for a white flower is r. The cross is between a heterozygous red-flowered plant (Rr) and a white-flowered plant (rr). The following Punnett square shows the combinations obtained from this cross.

The offspring are in the ratio of 2 red-flowered plants to 2 white-flowered plants, which when simplified, is 1:1.

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