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01-05-2018
Biology

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Down syndrome is also known as trisomy-21 because individuals with down syndrome ____.

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ezequiasbeauchp7t3ak ezequiasbeauchp7t3ak

10-05-2018

with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.

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