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down syndrome: - ______ mutation during __________- the individual has ____ chromosomes instead of ___, due to ______ of chromosome 21- during ____, there is a chance that _____ do not separate- upon fertilisation, the ___ inherits ___ copies of chromosome 21 resulting in a total of ___ chromosomes- usually occurs in ____ cells, but occasionally occurs in ___ cells- the older the mother, the ____ the chance that copies of chromosome 21 will ______ during ______

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