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The number of chromosomes in parents and offsprings of a particular species remains constant due to 

(a) doubling of chromosomes after zygote formation 

(b) halving of chromosomes during gamete formation 

(c) doubling of chromosomes after gamete formation 

(d) halving of chromosomes after gamete formation

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The answer is (b) halving of chromosomes during gamete formation.

  • Because of halving of chromosome during gamete formation number of chromosome  same as somatic cell of an organism.
  • Halving of gametes in a chromosomes is called diploid number of chromosomes.

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