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ELEN [110]
3 years ago
6

When a child is born with down syndrome, when did the mutation occur?

Biology
2 answers:
DerKrebs [107]3 years ago
8 0
It occurred during meiosis.
Varvara68 [4.7K]3 years ago
5 0
It occurred doing meiosis, as when the gametes were combining a third chromosome was added to the 21st pair and caused Trisomy 21 Sydnrome, or as we know it, Down’s Syndrome.
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