Write about dihybrid cross with the help of checker board?

Explanation

The cross made between individuals differring in two characters is knows as Dihybrid cross. Mendel studied the inheritance of two characters at a time. Mendel crossed a homozygous pea plant having yellow and round seeds with another pea plant having green and wrinked seeds. The `F_(1)` hybrids were found to have yellow and round seeds. This shows that are sominant.
When `F_(1)` plants allowed to cross among themselves, four distinct types of seeds appeared in `F_(2)` generation. Two these were similar to parental combinations, while the other two were new combinations. The phenotypic ratio of `9:3:3:1` can be derived as a combination series of 9 round yellow, 3 round green, 3 wrinkled ywllow, 1 wrinkled green.