Question

with the help of pinnet square/checker board show the dihybrid cross taking two pairs of characters.

Answer 1

Take a cross between a plant with wrinkled and yellow seeds (rrYY) and plant with round and green seeds (RRyy).
Round seeds are dominant over wrinkled and yellow seeds are dominant over green seeds.

rrYY X RRyy

	RY	Ry	rY	ry
RY	RRYY	RRYy	RrYY	RrYy
Ry	RRYy	RRyy	RrYy	Rryy
rY	RrYY	RrYy	rrYY	rrYy
ry	RrYy	Rryy	rrYy	rryy

The phenotypic ratio is:- 9:3:3:1
9 are round and yellow.
3 are round and green.
3 are wrinkled and yellow.
1 is wrinkled and green.