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Một TB sinh dục sơ khai thực hiện nguyên phân một số lần tại vùng sinh sản, tất cả TB sinh ra đều trở thành TB sinh tinh thực hiện giảm phân tạo tinh trùng. Quá trình trên đã sử dụng từ môi trường nội bào 630 NST ở trạng thái chưa nhân đôi.Biết rằng hiệu suất thụ tinh là 25% đã tạo ra 32 hợp tử. Xác định: a. Số lần nguyên phân của Tb sinh dục sơ khai. b. Bộ NST lưỡng bội của loài.
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