Tại sao bà nội thường quý cháu gái hơn?
ỷ lệ gene giống nhau giữa bà nội và cháu gái cao hơn hẳn so với cháu trai, vì thế mà cháu gái luôn có nhiều điểm tương đồng với bà nội hơn.Telegraph cho biết, các nhà khoa học của Đại học Cambridge sử dụng quy luật di truyền để tìm hiểu mức độ tương đồng về gene giữa một phụ nữ với các cháu. Kết quả cho thấy, nếu tính trung bình thì khoảng 25% gene của bà giống hệt các cháu (cả nam và nữ).
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