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Barrett Whitehead
Biology
20 May, 20:27
What causes Down's syndrome
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Peppa Pig
20 May, 20:32
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Down's syndrome is also called Trisomy 21.
usually a normal person will have 46 chromosomes. for person with this syndrome, he/she has 47 chromosomes results from an error in cell division.
the person has 3 copies of chromosome 21 instead of 2 copies.
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