Nguyễn Thị Thu Phương

1 năm trước

Gen B có 558 nucleotit loại Xitozin và 3294 liên kết hidro. Gen B đột biến thành gen b. Gen B và gen b có chiều dài bằng nhau nhưng gen b nhiều hơn gen B một liên kết hidro. 1/ Đột biến trên thuộc dạng nào của đột biến gen? Giải thích. 2/ Xác định số lượng từng loại nucleotit trong gen B và gen b?

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vovuhanh

1 năm trước

$a$,

Độ biến trên là: Thay thế 1 cặp A-T bằng 1 cặp G-X

$b$,

Ta có:

$H=2A+3G=2T+3X=2T+3×558=3294$

⇒$T=810nu$

Số nu mỗi loại của gen B:

$A=T=810nu$

$G=X=558nu$

Số nu mỗi loại của gen b:

$A=T=810-1=809nu$

$G=X=558+1=559nu$

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