Gametes are haploid ( half the number of an individual's chromosome ) structures . For eg . In human beings , total no. of chromosomes are 46 while gametes of the same have 23 chromosomes. Gametes are structures of pre-fertilization event . Gametes fuse to form zygote

Fusion of gametes is called fertilization .

First event that happens in post-fertilization is formation of zygote . Zygotes are made when 2 gametes fuse . Zygote turns out to be diploid (actual no. of individual's chromosome) as 2 haploid gametes fuse .In case of humans : 1 gamete (23 chromosomes) + 1 gamete (23 chromosomes) = 1 zygote (46 chromosomes) . Zygote further forms complete organisms by .

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