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Science · 2022 · 4 marks
CBSE 2022 · Region 4 · Set 2 · Q15
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental cues, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However, in human beings, the sex of an individual is largely determined genetically.(a)In what way are the sex chromosomes 'X' and 'Y' different in size ? Name the mismatched pair of sex chromosome in humans.(b)Write the number of chromosomes present in human beings apart from sex chromosomes. Which of the parent has a mismatched pair of sex chromosomes?(c)Citing two examples, justify the statement "Sex of an individual is not always determined genetically".OR Draw a flow chart to show that sex is determined genetically in human beings.
Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental cues, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However, in human beings, the sex of an individual is largely determined genetically.
(a)
In what way are the sex chromosomes 'X' and 'Y' different in size ? Name the mismatched pair of sex chromosome in humans.
(b)
Write the number of chromosomes present in human beings apart from sex chromosomes. Which of the parent has a mismatched pair of sex chromosomes?
(c)
Citing two examples, justify the statement "Sex of an individual is not always determined genetically".
OR Draw a flow chart to show that sex is determined genetically in human beings.
Marking-scheme solution
\(\displaystyle \frac{1}{2} \times 4\)
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.