Question

In corn plants, the allele for green kernels (g) is dominant over clear kernels (g). A homozygous dominant plant is crossed with a homozygous recessive plant. What is the phenotypic ratio of the offspring in scenario 1?

Answer 1

When a homozygous dominant green kernel corn plant is crossed with a homozygous recessive clear kernel plant, all offspring are heterozygous 'Gg', resulting in a phenotypic ratio of 100% green kernels.

Step-by-step explanation:

The question asks about the phenotypic ratio of the offspring when a corn plant with homozygous dominant green kernels is crossed with a corn plant that is homozygous recessive for clear kernels. In this scenario, all the offspring will be heterozygous and express the dominant green kernel phenotype, because they will each inherit one dominant allele from the green kernel parent and one recessive allele from the clear kernel parent. The use of a Punnett square can illustrate this outcome, as it involves placing the alleles of one parent on the top and the alleles of the other parent on the side and then filling in the possible genotypes of the offspring. In this case, all offspring would have the genotype 'Gg', leading to a phenotypic ratio of 100% green kernels.