In a pea plant, round seeds are dominant over wrinkled seeds. A plant heterozygous for round seeds was crossed with a plant with wrinkled seeds. Which among the following will agree with the expected result?

99 round and 300 wrinkled

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301 round and 100 wrinkled

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305 round and 301 wrinkled

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200 round and 100 wrinkled

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Solution

The correct option is C 305 round and 301 wrinkled

Genotype of heterozygous dominant round seeds: Rr

Genotype of homozygous recessive wrinkled seeds: rr

The cross will be as follows:

The phenotypic ratio from the cross is 1 : 1

For 99 round and 300 wrinkled seeds, the ratio is approximately 1:3.

For 301 round and 100 wrinkled seeds, the ratio is approximately 3:1.

For 200 round and 100 wrinkled seeds, the ratio is approximately 2:1

For 305 round and 301 wrinkled seeds, the ratio is approximately 1:1, which matches with the expected phenotypic ratio.

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