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Science · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 2 · Q11
A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg).(i)What colour of the stem would you expect in their F1 progeny ?(ii)In what ratio would you find the green and purple coloured stem in plants of F2 progeny ?(iii)What conclusion can be drawn for the above observations ?
A green stemmed tomato plant denoted by (GG) is crossed with a tomato plant with purple stem denoted by (gg).
(i)
What colour of the stem would you expect in their F1 progeny ?
(ii)
In what ratio would you find the green and purple coloured stem in plants of F2 progeny ?
(iii)
What conclusion can be drawn for the above observations ?
Marking-scheme solution
(i)
Green
(ii)
Green stem : Purple stem
\[3 \text { : } 1
\]
(iii)
Conclusion: In two contrasting characters or alternative forms one of the forms is dominant over the other which is recessive. / Green stem colour is dominant over purple stem / dominant traits are expressed in the presence of recessive trait.
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.