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Science · 2022 · 4 marks
CBSE 2022 · Region 2 · Set 1 · Q14
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)
Name the recessive traits in above case.
(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
(c) Tall with wrinkled seeds : Short with round seeds
$\displaystyle 3$ : $\displaystyle 3$
$\displaystyle 1$ : $\displaystyle 1$
OR
(c)
• i) $\displaystyle 900$
ii) $\displaystyle 100$
When two individuals showing two different contrasting characteristics are bred with each other, then in F2 progeny new combinations are seen / visible as traits are independently inherited.
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