B\u00e0i 3 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0N\u00eau ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o gi\u1ed1ng lai cho \u01b0u th\u1ebf lai.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
– \u0110\u1ec3 t\u1ea1o ra con lai c\u00f3 \u01b0u th\u1ebf lai cao ng\u01b0\u1eddi ta th\u01b0\u1eddng ph\u1ea3i t\u1ea1o ra nhi\u1ec1u d\u00f2ng thu\u1ea7n kh\u00e1c nhau r\u1ed3i lai t\u1eebng c\u1eb7p d\u00f2ng thu\u1ea7n v\u1edbi nhau \u0111\u1ec3 d\u00f2 t\u00ecm t\u1ed5 h\u1ee3p lai cho \u01b0u th\u1ebf lai. C\u00f4ng vi\u1ec7c lai gi\u1ed1ng \u0111\u1ec3 t\u00ecm t\u1ed5 h\u1ee3p lai r\u1ea5t t\u1ed1n th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c.<\/p>\n
– \u01afu th\u1ebf lai th\u01b0\u1eddng bi\u1ec3u hi\u1ec7n cao nh\u1ea5t \u1edf \u0111\u1eddi F1 v\u00e0 sau \u0111\u00f3 gi\u1ea3m d\u1ea7n \u1edf c\u00e1c \u0111\u1eddi ti\u1ebfp theo. V\u00ec v\u1eady, ng\u01b0\u1eddi ta kh\u00f4ng d\u00f9ng con lai \u0111\u1ec3 l\u00e0m gi\u1ed1ng. C\u00e1c nh\u00e0 t\u1ea1o gi\u1ed1ng th\u01b0\u1eddng t\u1ea1o con lai c\u00f3 \u01b0u th\u1ebf lai cao s\u1eed d\u1ee5ng v\u00e0o m\u1ee5c \u0111\u00edch kinh t\u1ebf (th\u01b0\u01a1ng ph\u1ea9m).<\/p>\n
B\u00e0i 4 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao \u01b0u th\u1ebf lai cao nh\u1ea5t \u1edf F1<\/sub>\u00a0v\u00e0 gi\u1ea3m d\u1ea7n \u1edf \u0111\u1eddi sau?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
S\u1edf d\u0129 \u01b0u th\u1ebf lai th\u01b0\u1eddng bi\u1ec3u hi\u1ec7n cao nh\u1ea5t \u1edf \u0111\u1eddi F1 r\u1ed3i sau \u0111\u00f3 gi\u1ea3m d\u1ea7n l\u00e0 v\u00ec \u1edf c\u00e1c th\u1ebf h\u1ec7 sau, m\u1ee9c \u0111\u1ed9 d\u1ecb h\u1ee3p t\u1eed s\u1ebd gi\u1ea3m d\u1ea7n, \u0111\u1ed3ng h\u1ee3p t\u0103ng l\u00ean (trong \u0111\u00f3, \u0111\u1ed3ng h\u1ee3p l\u1eb7n c\u00f3 \u0111i\u1ec1u ki\u1ec7n bi\u1ec3u hi\u1ec7n ra ki\u1ec3u h\u00ecnh).<\/p>\n
B\u00e0i 5 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0C\u00e2u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y gi\u1ea3i th\u00edch v\u1ec1 \u01b0u th\u1ebf lai l\u00e0 \u0111\u00fang:<\/strong><\/p>\na) Lai hai d\u00f2ng thu\u1ea7n ch\u1ee7ng v\u1edbi nhau s\u1ebd lu\u00f4n cho ra con lai c\u00f3 \u01b0u th\u1ebf lai cao.<\/p>\n
b) Lai c\u00e1c d\u00f2ng thu\u1ea7n ch\u1ee7ng kh\u00e1c xa nhau v\u1ec1 khu v\u1ef1c \u0111\u1ecba l\u00ed lu\u00f4n cho \u01b0u th\u1ebf lai cao.<\/p>\n
c) Ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 t\u1ed5 h\u1ee3p lai gi\u1eefa c\u00e1c c\u1eb7p b\u1ed1 m\u1eb9 nh\u1ea5t \u0111\u1ecbnh m\u1edbi c\u00f3 th\u1ec3 cho \u01b0u th\u1ebf lai.<\/p>\n
d) Ng\u01b0\u1eddi ta kh\u00f4ng s\u1eed d\u1ee5ng con lai c\u00f3 \u01b0u th\u1ebf lai cao l\u00e0m gi\u1ed1ng v\u00ec con lai th\u01b0\u1eddng kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t v\u1ec1 ki\u1ec3u h\u00ecnh.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n: c.<\/p>\n
<\/p>\n<\/div>\n<\/div>\n
<\/p>\n<\/div>\n<\/div>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng nh\u1eefng c\u00e1ch n\u00e0o? L\u1eddi gi\u1ea3i: Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i th\u01b0\u1eddng l\u00e0 bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch lai gi\u1ed1ng ( lai c\u00e1c d\u00f2ng thu\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":"\n
Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p<\/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-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/\" \/>\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 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng nh\u1eefng c\u00e1ch n\u00e0o? L\u1eddi gi\u1ea3i: Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i th\u01b0\u1eddng l\u00e0 bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch lai gi\u1ed1ng ( lai c\u00e1c d\u00f2ng thu\u1ea7n […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-20T08:42:50+00:00\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/\",\"url\":\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/\",\"name\":\"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-03-20T08:42:50+00:00\",\"dateModified\":\"2018-03-20T08:42:50+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ph\u1ea7n N\u0103m – Ch\u01b0\u01a1ng 4 – B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/","og_locale":"en_US","og_type":"article","og_title":"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p","og_description":"B\u00e0i 1 (trang 78 SGK Sinh h\u1ecdc 12):\u00a0Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng nh\u1eefng c\u00e1ch n\u00e0o? L\u1eddi gi\u1ea3i: Ngu\u1ed3n bi\u1ebfn d\u1ecb di truy\u1ec1n c\u1ee7a qu\u1ea7n th\u1ec3 v\u1eadt nu\u00f4i th\u01b0\u1eddng l\u00e0 bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1eb1ng c\u00e1ch lai gi\u1ed1ng ( lai c\u00e1c d\u00f2ng thu\u1ea7n […]","og_url":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/","og_site_name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam","article_published_time":"2018-03-20T08:42:50+00:00","author":"H\u00e0 Trang","twitter_card":"summary_large_image","twitter_misc":{"Written by":"H\u00e0 Trang","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/","url":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/","name":"Ph\u1ea7n N\u0103m - Ch\u01b0\u01a1ng 4 - B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-03-20T08:42:50+00:00","dateModified":"2018-03-20T08:42:50+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/phan-nam-chuong-4-bai-18-chon-giong-vat-nuoi-va-cay-trong-dua-tren-nguon-bien-di-to-hop\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lop12.edu.vn\/"},{"@type":"ListItem","position":2,"name":"Ph\u1ea7n N\u0103m – Ch\u01b0\u01a1ng 4 – B\u00e0i 18: Ch\u1ecdn gi\u1ed1ng v\u1eadt nu\u00f4i v\u00e0 c\u00e2y tr\u1ed3ng d\u1ef1a tr\u00ean ngu\u1ed3n bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p"}]},{"@type":"WebSite","@id":"https:\/\/lop12.edu.vn\/#website","url":"https:\/\/lop12.edu.vn\/","name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/lop12.edu.vn\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45","name":"H\u00e0 Trang","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g","caption":"H\u00e0 Trang"},"url":"https:\/\/lop12.edu.vn\/author\/trangvth2\/"}]}},"_links":{"self":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/22773"}],"collection":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/comments?post=22773"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/22773\/revisions"}],"predecessor-version":[{"id":22782,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/22773\/revisions\/22782"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=22773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=22773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=22773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}