patypatyok
patypatyok
26-05-2017
Physics
contestada
what cause down syndrome
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JavaXD
JavaXD
26-05-2017
Missing Chromosomes! xD
Weird Question!
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lindseyspearman
lindseyspearman
26-05-2017
It is caused by an additional genetic material from chromosome 21. Implying, that person would have three number 21 chromosomes. (In most cases)
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