Spermatogenez (sperma va … genez) \u2014 hayvonlarda va ko’pchilik o’simliklarda dastlabki diploid jin- siy hujayralarni ixtisoslashgan erka- klik hujayralari \u2014 spermatozoidlar yoki spermiylarga aylanishi. Rivojla- nayotgan jinsiy qujayralar o’zaro sin- tsitial bog’langan. S. ko’payish, o’sish, etilish va spermatozoidlar shaklla- nishi davrlaridan iborat. Ko’payish davrida diploid hujayralar \u2014 sper- matogoniyalar bir necha marta mitoz bo’linadi va oxirgi interfazada DNK replikasiyalanadi. 2davrda ular o’sib, 1tartib spermatositlarga aylanadi. 3davrda 2 marta bo’linib etilish, ya’ni meyoz sodir bo’ladi. 1bo’linishda har bir spermatositdan 2 tadan 2tartib spermatositlar; 2bo’linishda 4 ta bir xil kattalikdagi spermatidlar hosil bo’ladi; xromosomalar soni 2 baravar kamayadi. Spermatidlar S.ning 4davri- ga o’tib, spermatozoidlarga aylanadi. Bu davrda ularning akrosomasi, xivchini va qo’shimcha yadrosi hosil bo’ladi; TSI- toplazmaning ko’p qismi ribosomalar, Golji kompleksi va endoplazmatik to’r bilan birga chiqib ketadi. Sper- matidlar ichidagi bunday o’zgarishlar telokinetik harakatlanish deyiladi. S. 3 kundan (bo’shliqichlilarda) 20 kun- gacha (odamda) davom etadi. S. ko’pchilik hayvonlarda urug’yo’lida, germafrodit hayvonlarda esa germafrodit gonadada, g’ovaktanlilarda mezogleyda ro’y beradi. O’simliklarda spermatozoidlar anteri- diyalarda hosil bo’ladi.<\/p>\n","protected":false},"excerpt":{"rendered":"
Spermatogenez (sperma va … genez) \u2014 hayvonlarda va ko’pchilik o’simliklarda dastlabki diploid jin- siy hujayralarni ixtisoslashgan erka- klik hujayralari \u2014 spermatozoidlar yoki spermiylarga aylanishi. Rivojla- nayotgan jinsiy qujayralar o’zaro sin- … 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":[206],"tags":[],"class_list":["post-126711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-s-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\/126711","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=126711"}],"version-history":[{"count":1,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/126711\/revisions"}],"predecessor-version":[{"id":126728,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/126711\/revisions\/126728"}],"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=126711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/categories?post=126711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/tags?post=126711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}