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 correct option is C (iii) and (iv)

In human males, all the chromosomes are paired perfectly except one. These unpaired chromosomes are:

• Y-chromosome and
  
• X-chromosome
  

In human males, one pair called as 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 as X.