The Punnett square represents the dihybrid cross between two pea plants. Here R represents the dominant allele for round shape of the seed and r represents the recessive allele for wrinkled shape of the seed. Y represents the dominant allele for yellow seed color and y represents the recessive allele for green seed color. Both the plants have the heterozygous genotype RrYy. What is the expected phenotypic ratio of dihybrid crosses?

Question

Noe

Biology

5 February, 20:51

The Punnett square represents the dihybrid cross between two pea plants. Here R represents the dominant allele for round shape of the seed and r represents the recessive allele for wrinkled shape of the seed. Y represents the dominant allele for yellow seed color and y represents the recessive allele for green seed color. Both the plants have the heterozygous genotype RrYy. What is the expected phenotypic ratio of dihybrid crosses?

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Maren Peterson · Answer 1

The answer is 9:3:3:1.

The expected phenotypic ratio of dihybrid crosses is 9:3:3:1. This means that in the cross of two plants with the heterozygous genotype RrYy there will be:

9 plants with round shape of seed and yellow seed color

3 plants with round shape of seed and green seed color

3 plants with wrinkled shape of seed and yellow seed color

1 plant with wrinkled shape of seed and green seed color