"In human males, all the chromosomes are paired perfectly except one. this/these unpaired chromosomes is/are" (i) large chromosome (ii) small chromosome (iii) Y-chromosome (iv) X-chromosome
A
(i) and (ii)
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B
(iii) only
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C
(iii) and (iv)
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D
(ii) and (iv)
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Solution
The correct option is C (iii) and (iv) In human males, the 23rd pair of chromosomes, or the sex chromosome pair, is not perfectly paired, and contains one X and one Y chromosomes. This combination determines the gender of the individual in humans.