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{"id":22865,"date":"2018-03-20T16:30:14","date_gmt":"2018-03-20T09:30:14","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=22865"},"modified":"2018-03-20T16:30:14","modified_gmt":"2018-03-20T09:30:14","slug":"phan-nam-chuong-1-bai-6-dot-bien-so-luong-nhiem-sac-the","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/phan-nam-chuong-1-bai-6-dot-bien-so-luong-nhiem-sac-the\/","title":{"rendered":"Ph\u1ea7n N\u0103m – Ch\u01b0\u01a1ng 1 – B\u00e0i 6: \u0110\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec5m s\u1eafc th\u1ec3"},"content":{"rendered":"

B\u00e0i 1 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau c\u00e1c d\u1ea1ng \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i \u1edf sinh v\u1eadt l\u01b0\u1ee1ng b\u1ed9i v\u00e0 h\u1eadu qu\u1ea3 c\u1ee7a t\u1eebng d\u1ea1ng.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n

* \u0110\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i l\u00e0 \u0111\u1ed9t bi\u1ebfn l\u00e0m thay \u0111\u1ed5i s\u1ed1 l\u01b0\u1ee3ng NST \u1edf m\u1ed9t hay m\u1ed9t s\u1ed1 c\u1eb7p NST t\u01b0\u01a1ng \u0111\u1ed3ng.<\/p>\n

\u1ede sinh v\u1eadt l\u01b0\u1ee1ng b\u1ed9i, \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i th\u01b0\u1eddng c\u00f3 d\u1ea1ng ch\u00ednh nh\u01b0 th\u1ec3 kh\u00f4ng (2n \u2013 2); th\u1ec3 m\u1ed9t (2n \u2013 1); th\u1ec3 m\u1ed9t k\u00e9p (2n \u2013 1 \u2013 1); th\u1ec3 ba (2n +1 ); th\u1ec3 b\u1ed1n (2n + 2); th\u1ec3 b\u1ed1n k\u00e9p (2n + 2 + 2 ).<\/p>\n

* H\u1eadu qu\u1ea3 c\u1ee7a \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i: S\u1ef1 t\u0103ng hay gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t hay v\u00e0i c\u1eb7p NST m\u1ed9t c\u00e1ch kh\u00e1c th\u01b0\u1eddng \u0111\u00e3 l\u00e0m m\u1ea5t c\u00e2n b\u1eb1ng c\u1ee7a to\u00e0n h\u1ec7 gen n\u00ean c\u00e1c th\u1ec3 l\u00each b\u1ed9i th\u01b0\u1eddng kh\u00f4ng s\u1ed1ng \u0111\u01b0\u1ee3c hay gi\u1ea3m s\u1ee9c s\u1ed1ng, gi\u1ea3m kh\u1ea3 n\u0103ng sinh s\u1ea3n t\u00f9y lo\u00e0i.<\/p>\n

– \u1ede ng\u01b0\u1eddi, trong s\u1ed1 c\u00e1c thai b\u1ecb s\u1ea9y t\u1ef1 nhi\u00ean c\u00f3 b\u1ea5t th\u01b0\u1eddng NST th\u00ec t\u1ec9 l\u1ec7 thai th\u1ec3 ba l\u00e0 53,7%, th\u1ec3 m\u1ed9t l\u00e0 15,3%… \u0110i\u1ec1u \u0111\u00f3 ch\u1ee9ng t\u1ecf \u0111a s\u1ed1 l\u1ec7ch b\u1ed9i g\u00e2y ch\u1ebft t\u1eeb giai \u0111o\u1ea1n s\u1edbm. N\u1ebfu s\u1ed1ng \u0111\u01b0\u1ee3c khi sinh \u0111\u1ec1u m\u1eafc nh\u1eefng b\u1ec7nh hi\u1ec3m ngh\u00e8o nh\u01b0 h\u1ed9i ch\u1ee9ng \u0110ao (ba NST s\u1ed1 21), h\u1ed9i ch\u1ee9ng T\u1edbcn\u01a1 (ch\u1ec9 c\u00f3 m\u1ed9t NST gi\u1edbi t\u00ednh X)\u2026<\/p>\n

– \u1ede th\u1ef1c v\u1eadt, c\u0169ng \u0111\u00e3 g\u1eb7p c\u00e1c l\u1ec7nh b\u1ed9i, \u0111\u1eb7c bi\u1ec7t \u1edf chi C\u00e0 v\u00e0 chi L\u00faa. V\u00ed d\u1ee5, \u1edf c\u00e0 \u0111\u1ed9c d\u01b0\u1ee3c \u0111\u00e3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c l\u1ec7ch b\u1ed9i \u1edf c\u1ea3 12 c\u1eb7p NST t\u01b0\u01a1ng \u0111\u1ed3ng cho c\u00e1c d\u1ea1ng qu\u1ea3 kh\u00e1c nhau v\u1ec1 h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc c\u0169ng nh\u01b0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c gai.<\/p>\n

Tuy nhi\u00ean, \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i cung c\u1ea5p nguy\u00ean cho qu\u00e1 tr\u00ecnh ti\u1ebfn h\u00f3a. Trong ch\u1ecdn gi\u1ed1ng, c\u0169ng c\u00f3 th\u1ec3 d\u00f9ng l\u1ec7ch b\u1ed9i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a gen tr\u00ean NST.<\/p>\n

B\u00e0i 2 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0Ph\u00e2n bi\u1ec7t t\u1ef1 \u0111a b\u1ed9i v\u00e0 d\u1ecb \u0111a b\u1ed9i. Th\u1ebf n\u00e0o l\u00e0 th\u1ec3 song nh\u1ecb b\u1ed9i?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

* Ph\u00e2n bi\u1ec7t t\u1ef1 \u0111a b\u1ed9i v\u00e0 d\u1ecb \u0111a b\u1ed9i:<\/p>\n

– \u0110\u1ed9t bi\u1ebfn t\u1ef1 \u0111a b\u1ed9i l\u00e0 d\u1ea1ng \u0111\u1ed9t bi\u1ebfn l\u00e0m t\u0103ng b\u1ed9 NST \u0111\u01a1n b\u1ed9i c\u1ee7a m\u1ed9t lo\u00e0i v\u00e0 l\u1edbn h\u01a1n 2n. C\u01a1 th\u1ec3 sinh v\u1eadt mang b\u1ed9 NST b\u1ea5t th\u01b0\u1eddng nh\u01b0 3n, 4n, 5n, 6n, 7n, 8n\u2026.<\/p>\n

– D\u1ecb \u0111a b\u1ed9i l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng l\u00e0m gia t\u0103ng s\u1ed1 b\u1ed9 NST \u0111\u01a1n b\u1ed9i c\u1ee7a hai lo\u1ea1i kh\u00e1c nhau trong m\u1ed9t t\u1ebf b\u00e0o. Lo\u1ea1i \u0111\u1ed9t bi\u1ebfn n\u00e0y ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e1t sinh \u1edf c\u00e1c con lai kh\u00e1c lo\u00e0i. N\u1ebfu \u1edf con lai x\u1ea3y ra \u0111\u1ed9t bi\u1ebfn \u0111a b\u1ed9i l\u00e0m t\u0103ng g\u1ea5p \u0111\u00f4i s\u1ed1 l\u01b0\u1ee3ng c\u1ea3 2 b\u1ed9 NST c\u1ee7a hai lo\u00e0i kh\u00e1c nhau th\u00ec s\u1ebd t\u1ea1o ra th\u1ec3 d\u1ecb t\u1ee9 b\u1ed9i.<\/p>\n

* Th\u1ec3 song nh\u1ecb b\u1ed9i: Hi\u1ec7n t\u01b0\u1ee3ng \u1edf con lai x\u1ea3y ra \u0111\u1ed9t bi\u1ebfn \u0111a b\u1ed9i l\u00e0m t\u0103ng g\u1ea5p \u0111\u00f4i s\u1ed1 l\u01b0\u1ee3ng c\u1ea3 2 b\u1ed9 NST c\u1ee7a hai lo\u00e0i kh\u00e1c nhau th\u00ec s\u1ebd t\u1ea1o ra th\u1ec3 d\u1ecb t\u1ee9 b\u1ed9i (c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1ec3 song nh\u1ecb b\u1ed9i).<\/p>\n

B\u00e0i 3 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau m\u1ed9t v\u00e0i v\u00ed d\u1ee5 v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng \u0111a b\u1ed9i \u1edf th\u1ef1c v\u1eadt.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n

M\u1ed9t v\u00e0i v\u00ed d\u1ee5 v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng \u0111a b\u1ed9i \u1edf th\u1ef1c v\u1eadt:<\/p>\n

– Karpechenco \u0111\u00e3 lai c\u1ea3i c\u1ee7 (Raphamus) c\u00f3 2n = 18R v\u1edbi c\u1ea3i b\u1eafp (Brassia) c\u00f3 2n = 18B, con lai F1 b\u1ea5t th\u1ee5 c\u00f3 18 NST (9R + 9B) do b\u1ed9 NST kh\u00f4ng t\u01b0\u01a1ng \u0111\u1ed3ng. Sau \u0111\u00f3 \u00f4ng \u0111\u00e3 may m\u1eafn nh\u1eadn \u0111\u01b0\u1ee3c th\u1ec3 d\u1ecb \u0111a b\u1ed9i (song nh\u1ecb b\u1ed9i h\u1eefu th\u1ee5) c\u00f3 b\u1ed9 NST 18R + 18B.<\/p>\n

– C\u00e0 \u0111\u1ed9c d\u01b0\u1ee3c \u0111\u00e3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c l\u1ec7ch b\u1ed9i c\u1ea3 12 c\u1eb7p NST t\u01b0\u01a1ng \u0111\u1ed3ng cho c\u00e1c d\u1ea1ng qu\u1ea3 kh\u00e1c nhau v\u1ec1 h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc c\u0169ng nh\u01b0 s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c gai.<\/p>\n

B\u00e0i 4 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a th\u1ec3 \u0111a b\u1ed9i.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a th\u1ec3 \u0111a b\u1ed9i l\u00e0:<\/p>\n

– T\u1ebf b\u00e0o \u0111a b\u1ed9i c\u00f3 s\u1ed1 l\u01b0\u1ee3ng ADN t\u0103ng g\u1ea5p b\u1ed9i n\u00ean qu\u00e1 tr\u00ecnh sinh t\u1ed5ng h\u1ee3p c\u00e1c ch\u1ea5t h\u1eefu c\u01a1 x\u1ea3y ra m\u1ea1nh m\u1ebd. V\u00ec v\u1eady, th\u1ec3 \u0111a b\u1ed9i c\u00f3 t\u1ebf b\u00e0o to, c\u01a1 quan sinh d\u01b0\u1ee1ng l\u1edbn, ph\u00e1t tri\u1ec3n kh\u1ecfe, ch\u1ed1ng ch\u1ecbu t\u1ed1t.<\/p>\n

– C\u00e1c th\u1ec3 t\u1ef1 \u0111a b\u1ed9i l\u1ebb (3n, 5n\u2026) h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng sing giao t\u1eed b\u00ecnh th\u01b0\u1eddng. Nh\u1eefng gi\u1ed1ng c\u00e2y \u0103n qu\u1ea3 kh\u00f4ng h\u1ea1t nh\u01b0 nho, d\u01b0a h\u1ea5u,\u2026 th\u01b0\u1eddng l\u00e0 t\u1ef1 \u0111a b\u1ed9i l\u1ebb v\u00e0 kh\u00f4ng c\u00f3 h\u1ea1t. Hi\u1ec7n t\u01b0\u1ee3ng \u0111a b\u1ed9i th\u1ec3 kh\u00e1 ph\u1ed5 bi\u1ebfn \u1edf th\u1ef1c v\u1eadt trong khi \u1edf \u0111\u1ed9ng v\u1eadt l\u00e0 t\u01b0\u01a1ng \u0111\u1ed1i hi\u1ebfm.<\/p>\n

– \u0110\u1ed9t bi\u1ebfn \u0111a b\u1ed9i \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh ti\u1ebfn h\u00f3a v\u00ec n\u00f3 g\u00f3p ph\u1ea7n h\u00ecnh th\u00e0nh n\u00ean lo\u00e0i m\u1edbi.<\/p>\n

B\u00e0i 5 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi \u0111\u00fang.<\/strong><\/p>\n

\u00a0 S\u1ef1 kh\u00f4ng ph\u00e2n li c\u1ee7a m\u1ed9t c\u1eb7p NST t\u01b0\u01a1ng \u0111\u1ed3ng \u1edf t\u1ebf b\u00e0o sinh d\u01b0\u1ee1ng s\u1ebd l\u00e0m xu\u1ea5t hi\u1ec7n \u0111i\u1ec1u g\u00ec?<\/strong><\/p>\n

a) T\u1ea5t c\u1ea3 c\u00e1c t\u1ebf b\u00e0o c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ec1u mang \u0111\u1ed9t bi\u1ebfn.<\/strong><\/p>\n

\u00a0 \u00a0 b) Ch\u1ec9 c\u01a1 quan sinh d\u01b0\u1ee1ng mang t\u1ebf b\u00e0o \u0111\u1ed9t bi\u1ebfn.<\/strong><\/p>\n

\u00a0 \u00a0 c) T\u1ea5t c\u1ea3 c\u00e1c t\u1ebf b\u00e0o sinh d\u01b0\u1ee1ng \u0111\u1ec1u mang \u0111\u1ed9t bi\u1ebfn, c\u00f2n t\u1ebf b\u00e0o sinh d\u1ee5c th\u00ec kh\u00f4ng.<\/strong><\/p>\n

\u00a0 \u00a0 d) Trong c\u01a1 th\u1ec3 s\u1ebd c\u00f3 hai d\u00f2ng t\u1ebf b\u00e0o: d\u00f2ng b\u00ecnh th\u01b0\u1eddng v\u00e0 d\u00f2ng mang \u0111\u1ed9t bi\u1ebfn.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110\u00e1p \u00e1n: d<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau c\u00e1c d\u1ea1ng \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i \u1edf sinh v\u1eadt l\u01b0\u1ee1ng b\u1ed9i v\u00e0 h\u1eadu qu\u1ea3 c\u1ee7a t\u1eebng d\u1ea1ng. L\u1eddi gi\u1ea3i: * \u0110\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i l\u00e0 \u0111\u1ed9t bi\u1ebfn l\u00e0m thay \u0111\u1ed5i s\u1ed1 l\u01b0\u1ee3ng NST \u1edf m\u1ed9t hay m\u1ed9t s\u1ed1 c\u1eb7p NST t\u01b0\u01a1ng \u0111\u1ed3ng. \u1ede sinh v\u1eadt l\u01b0\u1ee1ng b\u1ed9i, […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1397,1398],"yoast_head":"\nPh\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 1 - B\u00e0i 6: \u0110\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec5m s\u1eafc th\u1ec3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/phan-nam-chuong-1-bai-6-dot-bien-so-luong-nhiem-sac-the\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 1 - B\u00e0i 6: \u0110\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec5m s\u1eafc th\u1ec3\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 30 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau c\u00e1c d\u1ea1ng \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i \u1edf sinh v\u1eadt l\u01b0\u1ee1ng b\u1ed9i v\u00e0 h\u1eadu qu\u1ea3 c\u1ee7a t\u1eebng d\u1ea1ng. 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