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B\u00e0i 1 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0T\u1eeb m\u1ed9t lo\u00e0i sinh v\u1eadt, kh\u00f4ng c\u00f3 s\u1ef1 c\u00e1ch li v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00ed c\u00f3 th\u1ec3 h\u00ecnh th\u00e0nh n\u00ean c\u00e1c lo\u00e0i kh\u00e1c nhau \u0111\u01b0\u1ee3c kh\u00f4ng? Gi\u1ea3i th\u00edch.<\/strong><\/p>\n

Kh\u00f4ng c\u00f3 c\u00e1ch li \u0111\u1ecba l\u00ed th\u00ec lo\u00e0i m\u1edbi v\u1eabn c\u00f3 th\u1ec3 h\u00ecnh th\u00e0nh n\u1ebfu gi\u1eefa c\u00e1c ti\u1ec3u qu\u1ea7n th\u1ec3 c\u1ee7a c\u00f9ng m\u1ed9t lo\u00e0i c\u00f3 s\u1ef1 c\u00e1ch li n\u00e0o \u0111\u00f3 (nh\u01b0 c\u00e1ch li t\u1eadp t\u00ednh, c\u00e1ch li sinh th\u00e1i, lai xa v\u00e0 \u0111a b\u1ed9i h\u00f3a) khi\u1ebfn c\u00e1c c\u00e1 th\u1ec3 c\u1ee7a c\u00e1c ti\u1ec3u qu\u1ea7n th\u1ec3 kh\u00f4ng giao ph\u1ed1i v\u1edbi nhau ho\u1eb7c c\u00f3 giao ph\u1ed1i v\u1edbi nhau nh\u01b0ng \u0111\u1eddi con sinh ra b\u1ecb b\u1ea5t th\u1ee5.<\/p>\n

B\u00e0i 2 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0Lo\u00e0i b\u00f4ng tr\u1ed3ng \u1edf M\u0129 c\u00f3 b\u1ed9 NST 2n = 52 trong \u0111\u00f3 c\u00f3 26 NST l\u1edbn v\u00e0 26 NST nh\u1ecf. Lo\u00e0i b\u00f4ng \u1edf ch\u00e2u \u00c2u c\u00f3 b\u1ed9 NST 2n = 26 g\u1ed3m to\u00e0n NST l\u1edbn. Lo\u00e0i b\u00f4ng hoang d\u1ea1i \u1edf M\u0129 c\u00f3 b\u1ed9 NST 2n = 26 NST nh\u1ecf. H\u00e3y gi\u1ea3i th\u00edch c\u01a1 ch\u1ebf h\u00ecnh th\u00e0nh lo\u00e0i b\u00f4ng tr\u1ed3ng \u1edf M\u0129 c\u00f3 b\u1ed9 NST 2n = 52.<\/strong><\/p>\n

C\u01a1 ch\u1ebf h\u00ecnh th\u00e0nh lo\u00e0i b\u00f4ng \u1edf M\u0129 c\u00f3 b\u1ed9 NST 2n = 52 c\u00f3 th\u1ec3 l\u00e0 do lai xa, r\u1ed3i \u0111a b\u1ed9i ho\u00e1.<\/p>\n

B\u00e0i 3 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0Gi\u1ea3i th\u00edch c\u01a1 ch\u1ebf h\u00ecnh th\u00e0nh lo\u00e0i m\u1edbi b\u1eb1ng con \u0111\u01b0\u1eddng lai xa v\u00e0 \u0111a b\u1ed9i ho\u00e1.<\/strong><\/p>\n

C\u01a1 ch\u1ebf h\u00ecnh th\u00e0nh lo\u00e0i m\u1edbi b\u1eb1ng lai xa v\u00e0 \u0111a b\u1ed9i ho\u00e1 l\u00e0:<\/p>\n

– C\u00e1c lo\u00e0i c\u00f3 h\u1ecd h\u00e0ng g\u1ea7n g\u0169i c\u00f3 th\u1ec3 th\u1ee5 ph\u1ea5n cho nhau t\u1ea1o n\u00ean c\u00e1c con lai th\u01b0\u1eddng b\u1ea5t th\u1ee5.<\/p>\n

– Con lai kh\u00e1c lo\u00e0i n\u1ebfu \u0111\u01b0\u1ee3c \u0111\u1ed9t bi\u1ebfn l\u00e0m nh\u00e2n \u0111\u00f4i s\u1ed1 l\u01b0\u1ee3ng NST (\u0111a b\u1ed9i h\u00f3a hay song nh\u1ecb b\u1ed9i) th\u00ec ch\u00fang c\u00f3 th\u1ec3 sinh s\u1ea3n b\u00ecnh th\u01b0\u1eddng. Ch\u00fang \u0111\u01b0\u1ee3c xem l\u00e0 m\u1ed9t lo\u00e0i m\u1edbi so v\u1edbi c\u00e1c lo\u00e0i b\u1ed1 m\u1eb9 v\u00ec khi lai tr\u1edf l\u1ea1i v\u1edbi c\u00e1c lo\u00e0i b\u1ed1 m\u1eb9 th\u00ec s\u1ebd cho ra con lai b\u1ea5t th\u1ee5 (c\u00e1ch li sinh s\u1ea3n v\u1edbi c\u00e1c lo\u00e0i b\u1ed1 m\u1eb9).<\/p>\n

B\u00e0i 4 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao l\u1ea1i ph\u1ea3i b\u1ea3o v\u1ec7 s\u1ef1 \u0111a d\u1ea1ng sinh h\u1ecdc c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y hoang d\u1ea1i c\u0169ng nh\u01b0 c\u00e1c gi\u1ed1ng c\u00e2y tr\u1ed3ng nguy\u00ean thu\u1ef7?<\/strong><\/p>\n

C\u1ea7n ph\u1ea3i b\u1ea3o v\u1ec7 s\u1ef1 \u0111a d\u1ea1ng c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y, ngay c\u1ea3 c\u00e1c c\u00e2y hoang d\u1ea1i v\u00ec sau n\u00e0y ch\u00fang ta c\u00f3 th\u1ec3 khai th\u00e1c nh\u1eefng gen qu\u00fd hi\u1ebfm t\u1eeb ch\u00fang ho\u1eb7c t\u1ea1o ra c\u00e1c gi\u1ed1ng c\u00e2y tr\u1ed3ng m\u1edbi.<\/p>\n

B\u00e0i 5 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi \u0111\u00fang nh\u1ea5t.<\/strong><\/p>\n

T\u1eeb qu\u1ea7n th\u1ec3 c\u00e2y 2n, ng\u01b0\u1eddi ta t\u1ea1o ra \u0111\u01b0\u1ee3c qu\u1ea7n th\u1ec3 c\u00e2y 4n. Qu\u1ea7n th\u1ec3 c\u00e2y 4n c\u00f3 th\u1ec3 xem l\u00e0 m\u1ed9t lo\u00e0i m\u1edbi v\u00ec:<\/p>\n

a) Qu\u1ea7n th\u1ec3 c\u00e2y 4n c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1edbi qu\u1ea7n th\u1ec3 c\u00e2y 2n v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng NST.<\/p>\n

b) Qu\u1ea7n th\u1ec3 c\u00e2y 4n kh\u00f4ng th\u1ec3 giao ph\u1ea5n \u0111\u01b0\u1ee3c v\u1edbi c\u00e1c c\u00e2y c\u1ee7a qu\u1ea7n th\u1ec3 c\u00e2y 2n.<\/p>\n

c) Qu\u1ea7n th\u1ec3 c\u00e2y 4n giao ph\u1ea5n \u0111\u01b0\u1ee3c v\u1edbi c\u00e1c c\u00e2y c\u1ee7a qu\u1ea7n th\u1ec3 c\u00e2y 2n cho ra c\u00e2y lai 3n b\u1ecb b\u1ea5t th\u1ee5.<\/p>\n

d) Qu\u1ea7n th\u1ec3 c\u00e2y 4n c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i nh\u01b0 k\u00edch th\u01b0\u1edbc c\u00e1c c\u01a1 quan sinh d\u01b0\u1ee1ng l\u1edbn h\u01a1n h\u1eb3n c\u00e1c c\u00e2y c\u1ee7a qu\u1ea7n th\u1ec3 2n.<\/p>\n

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B\u00e0i 1 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0T\u1eeb m\u1ed9t lo\u00e0i sinh v\u1eadt, kh\u00f4ng c\u00f3 s\u1ef1 c\u00e1ch li v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00ed c\u00f3 th\u1ec3 h\u00ecnh th\u00e0nh n\u00ean c\u00e1c lo\u00e0i kh\u00e1c nhau \u0111\u01b0\u1ee3c kh\u00f4ng? Gi\u1ea3i th\u00edch. L\u1eddi gi\u1ea3i Kh\u00f4ng c\u00f3 c\u00e1ch li \u0111\u1ecba l\u00ed th\u00ec lo\u00e0i m\u1edbi v\u1eabn c\u00f3 th\u1ec3 h\u00ecnh th\u00e0nh n\u1ebfu gi\u1eefa c\u00e1c ti\u1ec3u qu\u1ea7n […]<\/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 S\u00e1u - Ch\u01b0\u01a1ng 1 - B\u00e0i 30: Qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh lo\u00e0i (ti\u1ebfp theo)<\/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-sau-chuong-1-bai-30-qua-trinh-hinh-thanh-loai-tiep-theo\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u1ea7n S\u00e1u - Ch\u01b0\u01a1ng 1 - B\u00e0i 30: Qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh lo\u00e0i (ti\u1ebfp theo)\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 132 SGK Sinh h\u1ecdc 12):\u00a0T\u1eeb m\u1ed9t lo\u00e0i sinh v\u1eadt, kh\u00f4ng c\u00f3 s\u1ef1 c\u00e1ch li v\u1ec1 m\u1eb7t \u0111\u1ecba l\u00ed c\u00f3 th\u1ec3 h\u00ecnh th\u00e0nh n\u00ean c\u00e1c lo\u00e0i kh\u00e1c nhau \u0111\u01b0\u1ee3c kh\u00f4ng? 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