question_answer 35)

  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:

                  (c) In human males, one pair called the sex chromosomes are unpaired. Here, one is a normal-sized X-chromosome while other is a short Y-chromosome. Women have a perfect pair of sex chromosomes, both called X.