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Science · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 3 · Q30
A pure pea plant bearing terminal flowers was cross-pollinated with a pure plant having axillary flowers. In F_1 generation, plants with axial…
A pure pea plant bearing terminal flowers was cross-pollinated with a pure plant having axillary flowers. In $\displaystyle \mathrm{F}_{1}$ generation, plants with axial flowers only were obtained. $\displaystyle \mathrm{F}_{1}$ generation plants are self-pollinated and $\displaystyle \mathrm{F}_{2}$ generation is obtained.
(a)
Work out the pattern of inheritance in this case.
(b)
What will be the ratio of plants obtained in $\displaystyle \mathrm{F}_{2}$ generation ?
Marking-scheme solution
(a)
Parents Axillaryflowers Terminal flowers
(aa)
Gametes A
Aa × Aa $\displaystyle 1$ $\displaystyle 3$
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.