`*` Ở giảm phân `I`, bộ `NST` tồn tại ở trạng thái `2n` kép nên
`-` Số `NST` đơn `= 0`
`-` Số `NST` kép `=20`
`-` Số tâm động `= 20`
`-` Số cromatic `= 40`
Ở kì sau, mỗi NST kép tách nhau ở tâm động và di chuyển về hai cực của tế bào.
Ở kỳ sau của quá trình nguyên phân, các NST tồn tại ở trạng thái đơn 4n = 40.
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