question_answer 52)

      The number of pair(s) of sex, chromosomes in the zygote of humans is (a) one                 (b) two                                 (c) three                              (d) four

Answer:

                  (a) The number of sex chromosomes in the zygote of humans is one pair. It is not always a perfect pair. In females, it is perfect with two X-chromosomes. However in males, there is one X-chromosome and one Y-chromosome.