KiÓm tra bµi cò   TiÕt 6- Bµi 6 §ét biÕn sè lîng NST I. §ét biÕn lÖch béi 1. kh¸i niÖm vµ ph©n lo¹i   ! "#$%   !& '()    * +  (,!-./'(01 2'3',4 5'3 2. C¬ chÕ ph¸t sinh a. Trong qóa tr×nh gi¶m ph©n Bé NST cña c¬ thÓ mÑ gi¶m ph©n Lo¹i giao tö thu ®/îc 2n 64(7 2n 89: ;<:=' 2n " 9: ;<:=' n (n+1) vµ (n-1) (n+2) vµ (n-2) Bé NST cña giao tö I Bé NST cña giao tö II Bé NST hîp tö thu ®/îc n-1 2n-2 n 2n-1 n-1 2n-1-1 n+1 2n+1 n+1 2n+2 n+2 2n+2+2 b. Trong qu¸ tr×nh thô tinh n-1 n-1 n-1 n n+1 n+2 3. HËu qu¶ vµ ý nghÜa >?@A /'3  2'35BC 4 II. §ét biÕn ®a béi? VÝ dô hiÖn t/îng dÞ da béi P: C¶i cñ X C¶i b¾p 2n=18R 2n=18B F1: 2n( 9R+9B) ®a béi ho¸ F2: 4n(18R+18B) (ThÓ song nhÞ béi) VÝ dô hiÖn t/îng tù da béi ë lóa m× cã 2n=14, khi bÞ ®é biÕn lóa m× cã bé NST cã thÓ cã nh÷ng tr/êng hîp sau: 3n=21 4n=28 5n= 35 6n=42 Tù da béi DÞ ®a béi %$D 3 1$ = E$F.  G$29 / ./ H$BC ,IJ!K/ .A ',LM1N ,IJ!K/. A  ',O , ;=<(;< := +  P Q:<  R ;):-  O+ Q:< ST1U1ST1U1 VT1VT11 WTEWG ST1L%XYNU1L%X6N W%1Z%XL[Y\[6N W1TGZE#L%XY\%X6N ]/ 5,.? !(0'-: /;^&_& ]/ '^ 5 `? a?4,a & 6(72n /JL2n-1N /J;b:L2n-1-1N / JL2n+1N /&JL2n+2N /&J;b:L2n+2+2N /;</L2n-2N © C©u 1TF./  '(0A  ', ,',/ c$ d  6$ ' R F$ !_ e$ '3 C©u 2: ë=f51Z1X/_', c$ 1[ 6$ G1 F$ H# e$ @c,6 . KiÓm tra bµi cò   TiÕt 6- Bµi 6 §ét biÕn sè lîng NST I. §ét biÕn lÖch béi 1. kh¸i niÖm vµ ph©n lo¹i   ! "#$%  . 9: ;<:=' n (n+1) vµ (n-1) (n+2) vµ (n-2) Bé NST cña giao tö I Bé NST cña giao tö II Bé NST hîp tö thu ®/îc n-1 2n-2 n 2n-1 n-1 2n-1-1 n+1 2n+1 n+1 2n+2 n+2 2n+2+2 b ST1U1ST1U1 VT1VT11 WTEWG ST1L%XYNU1L%X6N W%1Z%XL[Y[6N W1TGZE#L%XY\%X6N ]/ 5,.? !(0'-: /;^&_& ]/