Dihybrid Cross Example
Mendel crossed two features that were incompatible, such as the color and form of seeds, at a time. He crossed the spherical yellow seed and the green seed with wrinkles. In the F1 generation, he only succeeded in getting round yellow seeds. This demonstrated that seeds are often spherical and yellow.
In contrast, the seeds’ wrinkled shape and green color are distinct characteristics. F1 offspring were later self-pollinated. Four distinct seed combinations were produced as a result of the F2 generation. Within the phenotypic ratio is 9:3:3:1, there were wrinkled-yellow, round-yellow, wrinkled-green, and round-green seeds. He noticed a similar dominance and inheritance pattern during the monohybrid cross of these features. Hybridization also maintained the 3:1 phenotypic ratio of the round and wrinkled seed shape and the yellow and green seed color.
Consider the letters “Y” for seeds of yellow color, “g” for seeds of green color, “R” for seeds with a round shape, and “w” for seeds with a wrinkled shape. As a result, it is possible to deduce the parental genotype as “YYRR” (yellow-round seeds) and “yyrr” (green-wrinkled seeds).
Dihybrid Cross: Phenotypic Ratio, Definition, Diagram and Overview
A dihybrid cross is a mating experiment that takes place between 2 individuals who are identical hybrids for two traits. In a dihybrid cross, the cross happens between the two traits that are under observation. The two genes of the traits under study are located on different pairs of homologous chromosomes and assort independently during gamete formation. The dihybrid cross-phenotypic ratio is 9:3:3:1.