Biology
Answer
Gametes must be produced by meiosis so that the number of chromosomes in them is halved (n). It is so because when two such gametes fuse to form a zygote the original number of chromosomes is restored (2n). If the gametes are formed by mitosis their chromosome number will remain 2n and after fusion the resulting zygote will have 4n chromosomes which is not a normal condition for a species.
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