When a cross involves two characters, it is called a dihybrid cross. What happens when a parent homozygous dominant for both characters is bred with a parent homozygous recessive for both characters, and when the genes for the two characters are independent genes, that is, are on located on different chromosomes? Give an example of the results drawing on Mendel's experiments. Does each independent gene act as it would in a monohybrid cross?
Four different phenotypes result in the F2 generation, having a ratio of 9:3:3:1. For example, a cross between an pea plant with green/smooth pods (both homozygous dominant characters) and a plant with yellow/wrinkled pods (both homozygous recessive characters) produces an F1 generation where the individuals all are heterozygous for both characters. In the F2 generation, nine individuals show both of the dominant expressions and bear green/smooth pods, three show the dominant expression of one character and the recessive expression of the other character and bear green/wrinkled pods, three show the opposite combination of a dominant expression of one character and the recessive expression of the other character and bear yellow/smooth pods, and one shows both of the recessive expressions and bears yellow/wrinkled pods. Although plants are created, such as the middle two phenotypes, that are phenotypically different from the original P generation, each independent gene
