When two pea plants with green pods are crossed, some of the offspring have yellow pods. Determine the allele key and the genotype of all the plants involved. Write the genetic cross in details. Determine the genotypic and phenotypic ratios. A Genetic Cross of Two Pea Plants with Green Pods

A Genetic Cross of Two Pea Plants with Green Pods

When two pea plants with green pods are crossed, some of the offspring have yellow pods. To determine the allele key and the genotype of all the plants involved, a genetic cross can be conducted. In the genetic cross, the two parent plants are labeled “P” for the pea plant with green pods. The alleles in the two parent plants are labeled “G” for the green pod allele and “g” for the yellow pod allele. Since the two parent plants have green pods, the genotype of both plants is GG, meaning they both have two green pod alleles. When the two pea plants are crossed, their offspring will have the genotypes GG, Gg, and gg. The GG offspring will have green pods due to the two green pod alleles, while the Gg offspring will also have green pods due to the dominant green pod allele. The gg offspring, however, will have yellow pods due to the two yellow pod alleles.
The genetic cross will result in a Genotypic Ratio of 1:2:1, meaning that for every one GG offspring there will be two Gg and one gg offspring. The Phenotypic Ratio, on the other hand, will be 3:1, meaning that for every three green pod offspring there will be one yellow pod offspring. Cont…