Discuss Mendel's dihybrid cross with checker board.

Explanation

Mendel.s Dihybrid Cross with Checkerboard. A dihybrid cross involves two pairs of contrasting characters. For example, when a cross is made between yellow round and wrinkled green seeds (both pureline homozygous), plants with only yellow round seeds are seen in `F_(1)`-generation but in `F_(2)`- generation, four types of combinations are observed.
Two of these combinations are similar to the parental combinations and others are new combination (round green and wrinkled yellow).
The ratio of four combinations in `F_(2)`-generation comes out to be 9 (round, yellow) : 3 (round, green): 3 (wrinkled, yellow): 1 (wrinkled, green).
This ratio is called phenotypic dihybrid ratio. The cross can be seen as shown in the figure. Refer to fig. on page no. 74.