Question

Describe the dihybrid cross with the help of a checker-board.

Hint:

 A dihybrid cross follows a 9:3:3:1 phenotypic ratio; traits assort independently during gamete formation.

Answer 1

A dihybrid cross studies the inheritance of two different traits simultaneously. According to
Mendel’s law of independent assortment, the alleles for different traits segregate
independently during gamete formation.
Example: Cross between a pea plant with round yellow seeds (RRYY) and one with
wrinkled green seeds (rryy).
 

The phenotypic ratio obtained is 9:3:3:1.