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
(iii) and (iv) Y chromosome and X chromosome
Males have all 22 pairs of chromosomes paired perfectly. The 23rd pair of chromosome that is the pair of sex chromosomes are not paired perfectly because in the pair one chromosome is X and the other is Chromosome Y , so they are not paired perfectly.