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95% of Down syndrome is due to anaphase Ⅰ or Ⅱ(分裂後期) nondisjunction (prophase→metaphase→anaphase→telophase) 4% to Robertsonian translocation 1% to post-infertilization mitotic error(mosaic Down syndrome)
genetics
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO? Memorize
HirotoShishido
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