Question

explain mendel's dihybrid ratio with the help of any one cross.

Answer 1

The unit of each character is assorted or distributed into the gametes independently of the unit factors of any other character and get randomly rearranged in the offspring these is called Law of Independent Assortment[dihybrid]

Round Yellow                                                          Wrinkled Green

 RRYY                                                                           rryy

     RY                                                                            ry

F1 progeny                    RYry(Round Yellow0

            RY         Ry      rY       ry

RY       RRYY   RRYy   RryY  RrYy

Ry        RRYy   RRyy   RrYy   Rryy    F2 progeny

ry         RrYY    RrYy    rrYY   rrYy

ry         RrYy     Rryy    rrYy    rryy

Phenotypic Ratio=9[round yellow]:3[round green]:3[wrinkled yellow]:1[wrinkled green]