Green stemmed tomato plants are dominant over purple stemmed tomato plants.Draw the pattern of inheritance through two generations using a cross and answer the question that follow:
a)What colour of stem you expect in their F1 progeny?
b)Give the percentage of purple stemmed plants if F1 plants are self pollinated.
c)In what ratio would you find in genotypes GG and Gg in F2 progeny?

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Solution

The cross between the plants is shown below:

Parents: GG (green stem) × gg (purple stem)
Gametes: G g
F1: Gg (green stem)

F2:

G g

G GG Gg

g Gg gg

Phenotypic ratio: 3 (green) : 1 (purple)
Genotypic Ratio: 1 : 2 : 1

(a) All plants in F1 generation are green.
(b) In ratio 1 (,GG) : 2 (Gg), are obtained in F2 generation.

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