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ph20529b
2 năm trước
Trong một thí nghiệm từ 20 cây đậu Hà Lan mọc lên từ các hạt màu vàng người ta thu được tổng số 720 hạt trong đó có 9 hạt màu xanh . biết đậu Hà Lan tự thụ phấn rất nghiêm ngặt và không có đột biến xảy ra .Xác định tỉ lệ phân li kiểu hình của 20 cây đậu hà Lan :> Cần gấp !!
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