Question

In human males all the chromosomes are paired perfectly except one.This/these unpaired chromosome is/are 

(i) large chromosome 

(ii) small chromosome 

(iii) Y-chromosome 

(iv) X-chromosome 

(a) (i) and (ii) 

(b) (iii) only 

(c) (iii) and (iv) 

(d) (ii) and (iv)

Answer 1

The answer is (c) (iii) and (iv)

These are sex determining chromosomes that are not paired perfectly due to half size of Y chromosome.