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Science · 2022 · 4 marks
CBSE 2022 · Region 2 · Set 3 · Q15
Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He…
Mendel blended his knowledge of Science and mathematics to keep the count of the individuals exhibiting a particular trait in each generation. He observed a number of contrasting visible characters controlled in pea plants in a field. He conducted many experiments to arrive at the laws of inheritance.
(a)
What do the F1 progeny of tall plants with round seeds and short plants with wrinkled seeds look like ?
(b)
What are recessive traits ?
(c)
Mention the type of the new combinations of plants obtained in F2 progeny along with their ratio, if F1 progeny was allowed to self pollinate.
OR If $\displaystyle 1600$ plants were obtained in F2 progeny, write the number of plants having traits:
(i)
Tall with round seeds
(ii)
Short with wrinkled seeds Write the conclusion of the above experiment.
Marking-scheme solution
(a) Tall with round seeds
(b) Short with wrinkled seeds / Recessive traits are those traits which are not expressed in the presence of dominant trait.
(c) Tall with wrinkled seeds : Short with round seeds
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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.