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Science · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 3 · Q30
(a) Name any two pairs of contrasting characters other than height used by Mendel in his experiments. (b) On crossing a tall and a short pea plant,…
(a)
Name any two pairs of contrasting characters other than height used by Mendel in his experiments.
(b)
On crossing a tall and a short pea plant, Mendel obtained $\displaystyle \mathrm{F}_{1}$ generation in which all pea plants were tall.
(i)
Are these plants exactly the same as tall plants of the parent generation ? Write their gene combination.
(ii)
Give the percentage of short plants obtained in $\displaystyle \mathrm{F}_{2}$ generation when $\displaystyle \mathrm{F}_{1}$ plants are self-pollinated.
(iii)
In what ratio would you find TT and Tt in $\displaystyle \mathrm{F}_{2}$ generation ?
Marking-scheme solution
(a) Two pairs of contrasting characters:
Round and wrinkled shape of seed
Violet and white flowers
(b) (i) No ; Tt
(ii) $\displaystyle 25$%
(iii) TT : Tt - $\displaystyle 1$:$\displaystyle 2$
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.