Question

How to create a Punnett Square?

Parent seeds are RRyy(Round green) and rrYY(wrinkled yellow)

Also, the genotype and phenotype ratio?

Answer 1

The punnett square can be created in the following way:

Parent generation: Round green (RRyy) and wrinkled yellow (rrYY)
​ Gametes: Ry and rY
F1 generation: Round yellow (RrYy)

Gametes: RY, Ry, rY, ry

F2 generation:

	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 (Round yellow) : 3 (Round green) : 3 (Wrinkled yellow) : 1 (wrinkled green)
The genotypic ration is 1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1