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Solution


Q.

In human males all the chromosomes are paired perfectly except one. These unpaired chromosomes are:
(i) Large chromosome
(ii) Small chromosome
(iii) Y-chromosome
(iv) X-chromosome
1 (i), (ii)  
2 (iii) only  
3 (iii), (iv)  
4 (ii), (iv)  

Ans.

(3)

In human males, one pair called as the sex chromosomes are unpaired. Here, one is a normal sized X chromosome while the other is a short Y chromosome. Women have a perfect pair of sex chromosomes, both called as X. Whereas in males the X and Y chromosomes are not paired well.