t thẩy bài 1 chỉ cỏ câu 5 ₫ủng thôi
bài2 F1 dịhop tu 2 cặp gen KG : AaBb tạo F2 9A_B_ cao ̣̣̣̣̣̣̣̣̣,<tuong tac bo t́ro>
ti lệ giao tu 4/9AB,2/9Ab,2/9aB,1/9ab tố hop dc KH A_B_=(4/9+4/9-(4/9)*4/9)+2*2/9*2/9=64/81(Cao)
=>KH thẩp 1-64/81=17/81(B)
bài3 dh 2 cap tao 4 loai, 4*3=12
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