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Science · 2026 · 3 marks
CBSE 2026 · Region 3 · Set 2 · Q13
A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb). (a) State the colour of the flowers you would…
A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb).
(a)
State the colour of the flowers you would expect in their $\displaystyle \mathrm{F}_{1}$ progeny.
(b)
What must be the percentage of white flower plants in the $\displaystyle \mathrm{F}_{2}$ generation, if the $\displaystyle \mathrm{F}_{1}$ plants are self-pollinated ?
(c)
State the expected ratio of genotypes BB and bb in $\displaystyle \mathrm{F}_{2}$ progeny.
Marking-scheme solution
(a)
All Blue flowers
(b)
/
$\displaystyle 25$% flowers are white
(Blue: White \(\displaystyle =3: 1, \frac{1}{4} \times 100=25\) )
(c)
BB: bb :: $\displaystyle 1$: $\displaystyle 1$
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.