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Science · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 2 · Q11
A cross was made between green-stemmed tomato plants denoted by (GG) and purple-stemmed tomato plants denoted as (gg) to obtain F_1 progeny. (a) What…
A cross was made between green-stemmed tomato plants denoted by (GG) and purple-stemmed tomato plants denoted as (gg) to obtain $\displaystyle \mathrm{F}_{1}$ progeny.
(a)
What colour of the stem would you expect in their $\displaystyle \mathrm{F}_{1}$ progeny and why?
(b)
Give the percentage of purple-stemmed plants if $\displaystyle \mathrm{F}_{1}$ plants are allowed to self-pollinate to produce $\displaystyle \mathrm{F}_{2}$ progeny.
(c)
Write the ratio between GG and gg plants in the $\displaystyle \mathrm{F}_{2}$ progeny?
Marking-scheme solution
(a) Green; It is the dominant trait
(b) Purple stemmed plants in F2 progeny are $\displaystyle 25$%
(c) GG : gg
$\displaystyle 1$:$\displaystyle 1$
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.