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Solution


Q.

The number of chromosomes in parents and offspring of a particular species remains constant due to:
1 doubling of chromosomes after zygote formation.  
2 halving of chromosomes during gamete formation.  
3 doubling of chromosomes after gamete formation.  
4 halving of chromosomes after gamete formation  

Ans.

(2)

The number of chromosomes in parents and offspring of a particular species remains constant due to halving of chromosomes during gamete formation. The gametes are special type of cells which contain only half the amount of DNA as compared to normal cells of an organism. So, when a male gamete combines with a female gamete during sexual reproduction, then the new cell 'zygote' will have normal amount of DNA.