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Our genetic information is stored in 23 pairs of chromosomes that vary widely in size and shape. Chromosome 1 is the largest and is over three times bigger than chromosome 22. The 23rd pair of chromosomes are two special chromosomes, X and Y, that determine our sex.

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Excellent webpage of the human genome project

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Excellent webpage of the human genome project

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national human genome research institute

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For A Level Biology, Unit 1 for OCR exam board.

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Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells.