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-Gametes are sex cells.

-At fertilisation sperm and egg join together to form a zygotes.

-Normal body cells have the diploid number of chromosomes, whereas gametes have a haploid number of chromosomes.

-Fertilisation is random, so is the combination of zygotes, resulting in genetic diversity within a species.

-Gametes are formed by meiosis.

-Before meiosis stars, the DNA unravels and replicates into two copies of chromosomes.

-Meiosis has two main stags:

-> Prophase I  :   - Duplicated chromosomes condense and thicken. 


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