Krossingover (ing. crossing \u2014 over\u2014 chalkashuv) \u2014 chalkashish, gomolo- gik xromosomalarshng o’xshash qismlari b-n o’rin almashinishi natijasida xro- matida iplarining uzilishi va yangi tartibda birikishi. Birinchi marta amerikalik biolog T. Morgan aniqlagan (1911). Olim gomologik juft xromoso- malarda genlar doimo o’rin almashinib turishini drozofila (meva pashshasi) da o’tkazilgan tajribalarda isbotlagan. K. har xil genlar allellajning yangi kombinasiyalariga olib keladi. K. po- pulyasiyalarla kombinativ o’zgaruvchanlik paydo bo’lishiga olib kelishi tufayli tabiiy tanlanish uchun material beradi. K. aksariyat holdarda hujayralarning meyoz, ba’zan mitoz bo’linishida ro’y be- radi. K. DNK molekulasining har ikki, yoxud bitta ipida bir qancha genlar yoki genning bir qismiga ega bo’lgan xromo- somalar katta qismlarining qayta kom- binasiyalanishiga olib keladi. Genlar orasidagi K. chastotasi xromosomadagi genlararo masofani bildiradi. K.ni o’rganish natijasida xromosomalarning irsiy diskretligi isbotlandi; genlar- ning xromosomada to’g’ri chiziq bo’ylab joylashganligi va birikkan genlar guruhlari aniqlandi; xromosomalar- ning genetik xaritalari (har bir biri- kish guruhida genlarning nisbiy joyla- shish sxemasi)ni tuzish imkoniyatiga ega bo’lindi. K. kombinativ o’zgaruvchanlik miqdorini keskin oshirishi tufayli ta- biiy tanlanish va selektsiya uchun dastlab- ki material beradi. K. barcha hayvonlar, o’simliklar va mikroorganizmlar uchun xos.K. xrdisasidan genetik tahlil orqali genetikaning qator muammolari- ni echishda keng foydalaniladi. Ad.: Glo’shakova T. I., Razvitie pred- stavleniy ob individualnosti xromo- som, M., 1983. Sharifjon Turabekov, Mirfozil AB- Zalov.<\/p>\n","protected":false},"excerpt":{"rendered":"
Krossingover (ing. crossing \u2014 over\u2014 chalkashuv) \u2014 chalkashish, gomolo- gik xromosomalarshng o’xshash qismlari b-n o’rin almashinishi natijasida xro- matida iplarining uzilishi va yangi tartibda birikishi. Birinchi marta amerikalik biolog T. … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":99837,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[201],"tags":[],"class_list":["post-124016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-k-harfi","entry"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"kr","enabled_languages":["uz","kr","ru"],"languages":{"uz":{"title":true,"content":true,"excerpt":false},"kr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/124016","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/comments?post=124016"}],"version-history":[{"count":1,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/124016\/revisions"}],"predecessor-version":[{"id":124030,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/124016\/revisions\/124030"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/media\/99837"}],"wp:attachment":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/media?parent=124016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/categories?post=124016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/tags?post=124016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}