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18 July, 21:56

What genetic abnormality causes Down Syndrome? How does this usually happen?

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  1. 18 July, 22:05
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    The most common form of Down syndrome is known as trisomy 21, a condition where individuals have 47 chromosomes in each cell instead of 46. Trisomy 21 is caused by an error in cell division called nondisjunction. This leaves a sperm or egg cell with an extra copy of chromosome 21 before or at conception.
  2. 18 July, 22:13
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    An extra chromosome, also known as trisomy can lead to down syndrome.
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