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In humans there are 23 pairs of chromosomes in a diploid cell (a normal body cell e.g. a skin cell) However there are just 23 single chromosomes in a haploid cell (a sex cell e.g. a sperm) this is because when fertilisation takes place the embryo has a total of 46 chromosomes, as it takes both haploid cells, making it genetically identical to both it's mother and father, and making it a diploid cell.

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