the genotype of green stemmed tomato plant is GG and that of purple stemmed tomatao plant is gg hybrid of a cross b/w two were selfed to obtain f2 progeny , what will be the ratio of GG , Gg and gg in the progency. deduce by drawing the cross

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Solution

Here we are given that genotype of green stemmed tomato plant is GG and purple stemmed tomato plant is gg.
Parents: GG x gg
Gametes: G and g
F1 generation: Gg
On self crossing, the punnet square can be as follows
F2 generation: Gg x Gg
Gametes: G, g (for both the parents)

G
g
G
GG
Gg
g
Gg
gg

So, the ratio of GG : Gg : gg is 1 : 2 : 1.

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