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Science · 2023 · 2 marks
CBSE 2023 · Region 2 · Set 1 · Q23
Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in F_1 generation. (a) What is the gene…
Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in $\displaystyle \mathrm{F}_{1}$ generation.
(a)
What is the gene combination present in the plants of $\displaystyle \mathrm{F}_{1}$ generation ?
(b)
Give reason why only tall plants are observed in $\displaystyle \mathrm{F}_{1}$ progeny.
(c)
What will be the ratio of the plants obtained in the $\displaystyle \mathrm{F}_{2}$ generation when $\displaystyle \mathrm{F}_{1}$ plants are self-pollinated ?
Marking-scheme solution
(a) Tt
(b) Because only Dominant trait (Tall) is expressed in F1 generation / Tallness is dominant over recessive short trait.
(c) \(\displaystyle \mathrm{F}_{2}\) generation - Tall : short
$\displaystyle 3$ : $\displaystyle 1$
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.