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longdeptrai2004
2 năm trước
Câu 6. Ở người, tính trạng màu mắt, bệnh galactôzơ huyết và máu khó đông do 3 gen độc lập nhau quy định. Biết rằng mắt đen là tính trạng trội so với mắt xanh, bệnh máu khó đông do gen nằm trên nhiễm sắc thể giới tính quy định. Trong một gia đình, người chồng mắt đen, vợ mắt xanh, đều không mắc hai bệnh trên sinh con đầu lòng là con trai mắt xanh, bị cả hai bệnh galactôzơ huyết và máu khó đông. Nếu cặp vợ chồng trên muốn sinh thêm 2 người con nữa, tính xác suất trong các trường hợp sau: a. Sinh được hai con trai có kiểu gen giống bố. b. Sinh được con trai thứ hai có kiểu hình giống bố và con gái út có kiểu gen giống mẹ. c. Sinh được một con gái có kiểu hình giống bố và một con trai mắt xanh, bị một trong hai bệnh trên.
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