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Science · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 1 · Q6
(a) Mendel crossed two pea plants with visible contrasting characteristics and found that there were no half-way characteristics in the plants of F_1…
(a)
Mendel crossed two pea plants with visible contrasting characteristics and found that there were no half-way characteristics in the plants of $\displaystyle \mathrm{F}_{1}$ progeny. Explain the reason for this observation of Mendel.
OR
(b)
Justify the statement"Sex of the children will be determined by what they inherit from their father".
Marking-scheme solution
No halfway characteristics were found in the $\displaystyle \mathrm{F}_{1}$ generation because the $\displaystyle \mathrm{F}_{1}$ progeny is a mixture of contrasting traits of the parents but only one of the character of the parents gets expressed in $\displaystyle \mathrm{F}_{1}$ progeny.
The character that gets expressed is a dominant trait and that which does not get expressed in the presence of dominant trait is a recessive trait.
Mother has XX chromosome.
Father has XY chromosome.
All children inherit X chromosome from mother. The one who inherits X chromosome from father will be a girl and one who inherits Y chromosome from the father will be a boy. /
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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.