Answered

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

NCERT Class X
Science - Exemplar Problems

Chapter_Heredity and Evolution

Answer :

lohithanaidu
Option (a) is correct . There is only one pair of sex chromosomes .

The number of pair (s) of ‘sex chromosomes’ in the ‘zygote’ of humans is one.

Option: (a)

Explanation:  

  • ‘Zygote’ is the result of the fusion of the male and the female gametes resulting in the ‘formation of zygote’.  
  • A zygote hence contains the ‘same number of chromosomes’ as the adult individual. The zygote inherits one of the sex chromosome from each of the parents.  
  • Therefore, in a zygote there are two sex chromosome or a pair of ‘sex chromosomes’.
  • The sex chromosomes can be control the secondary sexual behaviour.

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