B\u00e0i 1 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0L\u00e0m th\u1ebf n\u00e0o c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c 2 gen n\u00e0o \u0111\u00f3 li\u00ean k\u1ebft hay ph\u00e2n li \u0111\u1ed9c l\u1eadp?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u1ec3 ph\u00e1t hi\u1ec7n 2 gen n\u00e0o \u0111\u00f3 c\u00f3 li\u00ean k\u1ebft hay ph\u00e2n li \u0111\u1ed9c l\u1eadp ta d\u00f9ng ph\u00e9p lai ph\u00e2n t\u00edch.<\/p>\n
– N\u1ebfu k\u1ebft qu\u1ea3 ph\u00e9p lai ph\u00e2n t\u00edch cho t\u1ec9 l\u1ec7 ki\u1ec3u h\u00ecnh 1 : 1: 1 : 1 th\u00ec 2 gen quy \u0111\u1ecbnh 2 t\u00ednh tr\u1ea1ng n\u1eb1m tr\u00ean 2 NST kh\u00e1c nhau.<\/p>\n
– N\u1ebfu t\u1ec9 l\u1ec7 ph\u00e2n li ki\u1ec3u h\u00ecnh \u1edf \u0111\u1eddi con l\u00e0 1 : 1 th\u00ec 2 gen li\u00ean k\u1ebft v\u1edbi nhau ho\u00e0n to\u00e0n.<\/p>\n
– N\u1ebfu k\u1ebft qu\u1ea3 ph\u00e9p lai ph\u00e2n t\u00edch cho 4 ki\u1ec3u h\u00ecnh v\u1edbi t\u1ec9 l\u1ec7 kh\u00f4ng b\u1eb1ng nhau, trong \u0111\u00f3 2 lo\u1ea1i ki\u1ec3u h\u00ecnh chi\u1ebfm \u0111a s\u1ed1 (tr\u00ean 50%) th\u00ec 2 gen c\u00f9ng n\u1eb1m tr\u00ean 1 NST \u0111\u00e3 x\u1ea3y ra ho\u00e1n v\u1ecb gen.<\/p>\n
B\u00e0i 2 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0C\u00f3 th\u1ec3 d\u00f9ng nh\u1eefng ph\u00e9p lai n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch gi\u1eefa 2 gen tr\u00ean NST? Ph\u00e9p lai n\u00e0o hay \u0111\u01b0\u1ee3c d\u00f9ng h\u01a1n? V\u00ec sao?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch gi\u1eefa 2 gen tr\u00ean NST ta c\u00f3 th\u1ec3 d\u00f9ng c\u00e1c ph\u00e9p lai. Tuy nhi\u00ean, t\u1ed1t nh\u1ea5t l\u00e0 d\u00f9ng ph\u00e9p lai ph\u00e2n t\u00edch. V\u00ec d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p lai ph\u00e2n t\u00edch, ng\u01b0\u1eddi ra d\u1ec5 d\u00e0ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c t\u1ea7n s\u1ed1 ho\u00e1n v\u1ecb gen, m\u00e0 t\u1ea7n s\u1ed1 ho\u00e1n v\u1ecb gen l\u00e0 th\u01b0\u1edbc \u0111o kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c gen tr\u00ean NST.<\/p>\n
\n
\n
B\u00e0i 3 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0Ru\u1ed3i gi\u1ea5m c\u00f3 4 c\u1eb7p NST. V\u1eady ta c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c t\u1ed1i \u0111a l\u00e0 bao nhi\u00eau nh\u00f3m gen li\u00ean k\u1ebft?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
– C\u00e1c gen li\u00ean k\u1ebft l\u00e0 c\u00e1c gen quy \u0111\u1ecbnh m\u1ed9t t\u00ednh tr\u1ea1ng c\u00f9ng n\u1eb1m tr\u00ean m\u1ed9t NST v\u00e0 di truy\u1ec1n c\u00f9ng nhau.<\/p>\n
– Ru\u1ed3i gi\u1ea5m c\u00f3 4 c\u1eb7p NST. V\u1eady ta c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c t\u1ed1i \u0111a l\u00e0 4 nh\u00f3m gen li\u00ean k\u1ebft.<\/p>\n
B\u00e0i 4 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0L\u00e0m th\u1ebf n\u00e0o c\u00f3 th\u1ec3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c 2 gen c\u00f3 kho\u1ea3ng c\u00e1ch b\u1eb1ng 50cM l\u1ea1i c\u00f9ng n\u1eb1m tr\u00ean m\u1ed9t NST?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Mu\u1ed1n bi\u1ebft \u0111\u01b0\u1ee3c 2 gen c\u00f3 kho\u1ea3ng c\u00e1ch b\u1eb1ng 50cm l\u1ea1i c\u00f9ng n\u1eb1m tr\u00ean m\u1ed9t NST, ta ph\u1ea3i x\u00e9t t\u1edbi gen th\u1ee9 3 n\u1eb1m gi\u1eefa 2 gen \u0111\u00f3 (ngh\u0129a l\u00e0 c\u00e1ch \u0111\u1ec1u 2 gen \u0111\u00f3).<\/p>\n
Khi hai gen n\u1eb1m g\u1ea7n nhau tr\u00ean m\u1ed9t nhi\u1ec5m s\u1eafc th\u1ec3 th\u00ec ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 t\u1ebf b\u00e0o b\u01b0\u1edbc v\u00e0o gi\u1ea3m ph\u00e2n x\u1ea3y ra trao \u0111\u1ed5i ch\u00e9o d\u1eabn \u0111\u1ebfn ho\u00e1n v\u1ecb gen. V\u00ec v\u1eady, t\u1ec9 l\u1ec7 % giao t\u1eed c\u00f3 ho\u00e1n v\u1ecb gen tr\u00ean t\u1ed5ng s\u1ed1 giao t\u1eed lu\u00f4n nh\u1ecf h\u01a1n 50%. Th\u1ef1c t\u1ebf, c\u00e1c gen n\u1eb1m c\u00e0ng xa nhau tr\u00ean nhi\u1ec5m s\u1eafc th\u1ec3 th\u00ec x\u00e1c su\u1ea5t \u0111\u1ec3 x\u1ea3y ra trao \u0111\u1ed5i ch\u00e9o gi\u1eefa ch\u00fang c\u00e0ng l\u1edbn v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. \u0110\u1ed1i v\u1edbi c\u00e1c nhi\u1ec5m s\u1eafc th\u1ec3 l\u1edbn, nh\u1eefng gen n\u1eb1m \u1edf hai \u0111\u1ea7u c\u1ee7a nhi\u1ec5m s\u1eafc th\u1ec3 th\u00ec ho\u00e1n v\u1ecb gen x\u1ea3y ra \u1edf h\u1ea7u h\u1ebft c\u00e1c t\u1ebf b\u00e0o khi b\u01b0\u1edbc v\u00e0o gi\u1ea3m ph\u00e2n v\u00e0 khi \u0111\u00f3 t\u1ea7n s\u1ed1 ho\u00e1n v\u1ecb gen c\u00f3 th\u1ec3 b\u1eb1ng 50%.<\/p>\n
Vi\u0301 du\u0323: t\u00e2\u0300n s\u00f4\u0301 hoa\u0301n vi\u0323 gen gi\u01b0\u0303a A va\u0300 B la\u0300 50%, gi\u01b0\u0303a A va\u0300 C la\u0300 30%, gi\u01b0\u0303a B va\u0300 C la\u0300 20% \u2192 A va\u0300 B pha\u0309i cu\u0300ng n\u0103\u0300m tr\u00ean 1 NST .<\/p>\n
<\/p>\n<\/div>\n<\/div>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0L\u00e0m th\u1ebf n\u00e0o c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c 2 gen n\u00e0o \u0111\u00f3 li\u00ean k\u1ebft hay ph\u00e2n li \u0111\u1ed9c l\u1eadp? L\u1eddi gi\u1ea3i: \u0110\u1ec3 ph\u00e1t hi\u1ec7n 2 gen n\u00e0o \u0111\u00f3 c\u00f3 li\u00ean k\u1ebft hay ph\u00e2n li \u0111\u1ed9c l\u1eadp ta d\u00f9ng ph\u00e9p lai ph\u00e2n t\u00edch. – N\u1ebfu k\u1ebft qu\u1ea3 ph\u00e9p lai […]<\/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":"\n
Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 2 - B\u00e0i 11: Li\u00ean k\u1ebft gen v\u00e0 ho\u00e1n v\u1ecb gen<\/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-2-bai-11-lien-ket-gen-va-hoan-vi-gen\/\" \/>\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 2 - B\u00e0i 11: Li\u00ean k\u1ebft gen v\u00e0 ho\u00e1n v\u1ecb gen\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 49 SGK Sinh h\u1ecdc 12):\u00a0L\u00e0m th\u1ebf n\u00e0o c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c 2 gen n\u00e0o \u0111\u00f3 li\u00ean k\u1ebft hay ph\u00e2n li \u0111\u1ed9c l\u1eadp? 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