Question

Choose the correct answer from the alternatives given.
In peas, yellow seed (Y) is dominant over green seed-(y). In this F2 generation of a monohybrid cross that begins when a dominant homozygote is crossed with a recessive homozygote, you would expect

• A. plants that produce three yellow seeds to every green seed
• B. plants with one yellow seed for every green seed
• C. only plants with the genotype Yy
• D. only plants that produce yellow seeds

Answer 1

The correct option is A plants that produce three yellow seeds to every green seed

In a monohybrid cross when a dominant homozygote is crossed with a recessive homozygote the heterozygous genotype will have a phenotypic character of the dominant phenotype. In such a cross the F2 progeny are formed in the phenotypic ratio of 3:1 and a genotypic ratio of 1:2:1. Since the yellow seed color is the dominant phenotypic character and the green seed color is the recessive phenotypic character in this cross, plants with yellow seed offsprings and green seed offsprings are formed in the ratio of 3:1 (phenotypic ratio). So, the correct option will be 'plants that produce three yellow seeds to every green seed'.