Question

The genotype of green stemmed tomato plant is denoted as GG and that of purple
stemmed tomato plant as gg. When these two are crossed (1)
a) What colour of stem would you expect in their F1 progeny?
b) In what ratio would you find the genotypes GG and Gg in the F2 progeny

Answer 1

Answer:

a) Green

b) 1:2

Explanation:

a) F1 progeny will b Gg and since there is a dominant allele, the colour will b green

b) GgXGg

G g

G GG Gg

g Gg gg

therefore the ratio of GG:Gg will be 1:2

Answer 2

Answer:

Explanation:

When we cross them to produce progeny in the F1 generation, we will find that all the plants have green stems

When we get the F2 generation to reproduce by self pollination we will now find that about 1/4th of the progeny will have purple stems and the remaining 3/4th will be green stemmed.

In other 25% of the progeny in the F2 generation are found to have purple stems.