CBSE 2025 · Region 3 · Set 1 · Q30 · 3 marks
A pure pea plant having round (R), yellow (Y) seeds is crossed with another pure pea plant having wrinkled (r), green (y) seeds. Subsequently $\displaystyle \mathrm{F}_{1}$ progeny is self-pollinated to obtain $\displaystyle \mathrm{F}_{2}$ progeny.(a)What do the seeds of $\displaystyle \mathrm{F}_{1}$ generation look like ?(b)Give the possible combinations of traits in seeds of $\displaystyle \mathrm{F}_{2}$ generation. Also give their ratio.(c)State the reason of obtaining seeds of new combination of traits in $\displaystyle \mathrm{F}_{2}$ generation.
A pure pea plant having round (R), yellow (Y) seeds is crossed with another pure pea plant having wrinkled (r), green (y) seeds. Subsequently $\displaystyle \mathrm{F}_{1}$ progeny is self-pollinated to obtain $\displaystyle \mathrm{F}_{2}$ progeny.
(a)
What do the seeds of $\displaystyle \mathrm{F}_{1}$ generation look like ?
(b)
Give the possible combinations of traits in seeds of $\displaystyle \mathrm{F}_{2}$ generation. Also give their ratio.
(c)
State the reason of obtaining seeds of new combination of traits in $\displaystyle \mathrm{F}_{2}$ generation.
Marking-scheme solution
(a) Round, yellow
(b)
wrinkled green : $\displaystyle 1$ (c) Traits are inherited independently/Independent assortment of the traits.| round yellow | : $\displaystyle 9$ |
| round green | : $\displaystyle 3$ |
| wrinkled yellow | : $\displaystyle 3$ |
HeredityMonohybrid and Dihybrid CrossesApplyshort_answermedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.