LAQ : What is a dihybrid cross? Describe the events of the dihybrid cross of plants with a checkerboard

A Dihybrid cross refers to a cross between two individuals that differ in two traits that are controlled by two different genes.

To find out whether one pair of alleles affects or influences the inheritance pattern of other alleles. In a dihybrid cross, Mendel considered two traits simultaneously. A cross conducted between two pure parents differing in two pairs of contrasting characters. He studied round and wrinkled seed characters along with yellow and green colours.

Yellow and round are dominant alleles so in an F₁ generation all plants with yellow and round are used. The above table is a punnet square for the F₁ generation.

Mendel allowed self-pollination in each hybrid of F1 and collected seeds separately and obtained F₂ generation. a checkerboard or punnet square for F₂ generation is shown in the image. He found seeds of four types in the 9:3:3:1 ratio which is a dihybrid ratio.