Ở gà, bộ NST 2n - 78 a) Một tế bào xôma của gà đang tiến hành nguyên phân. Tính số NST kép, số crômatit, số tâm động có trong tế bào ở kì đầu và kì sau của nguyên phân, Biết rằng quá trình nguyên phân diễn ra bình thường. b) Trong tinh bào của gà có 6250 tinh bào bậc 1 đều trải qua giảm phân hình thành tinh trùng, hiệu suất thụ tinh của tinh trùng bằng 0,1%. Các trứng hình thành trong buồng trứng của gà mái đều được đẻ ra và thu được 30 trứng. Sau khi ấp nở ra 16 gà con. Tính số NST có trong tất cả trứng không nở

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