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Gametes must be produced by meiosis for sexual reproduction. Why it is so?

Dear Student

Gametes for sexual reproduction shall be formed after meiosis because during meiosis the genetic material undergoes recombination and variations are produced which are very essential for evolution and increases the chances of survival. Mitosis does not generate variations and hence is not favoured for production of gametes. 

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Male and female gametes are produced by meiosis. It's necessary as number of chromosomes are halved in gametes and when they unite to form zygote which later on develop into organism will have deploid number of chromosomes, as their parents have.
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