Question

in pea plants, yellow peas (y) are dominant to green (y) and round peas (r) are dominant to wrinkled (r). two pea plants were crossed, one homozygous dominant for yellow round peas and one homozygous recessive for green wrinkled peas. what was the phenotypic ratio of the f2 generation?

Answer 1

The genotype of the plant with yellow round seeds will be YYRR and produce YR gametes, while the genotype of the plant with green wrinkled seeds will be yyrr and produce yr gametes.

The yellow round changed into YYRR and the green wrinkled become yyrr. The green, wrinkled parent presentations recessive phenotypes, which means that that must be homozygous recessive for both the pea coloration and pea shape genes. This corresponds with the genotype yyrr.

for the reason that yellow seeds are dominant to green, the allele for yellow seeds need to be represented with higher case letter while the only for inexperienced seeds have to be written in decrease case letter. let's think that the allele for yellow seed is Y and that for green seeds is y. as a result the genotype of the heterozygous yellow seeded plant may be "Yy" and that for green seeded plant could be "yy" (as the recessive allele is expressed best in homozygous conditions). The pass between heterozygous yellow seeded plant and green seeded plant will produce 50% yellow seeded plants and 50% green seeded plant life.

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