Yeni yay\u0131mlanan bir ara\u015ft\u0131rma, y\u00fcr\u00fcyen hayvanlar\u0131n karma\u015f\u0131k kal\u00e7a yap\u0131s\u0131n\u0131n bal\u0131klardaki basit kal\u00e7a yap\u0131s\u0131ndan evrimle\u015fme s\u00fcrecinin, daha \u00f6nceleri d\u00fc\u015f\u00fcn\u00fcld\u00fc\u011f\u00fcnden \u00e7ok daha basit bir \u015fekilde ger\u00e7ekle\u015fti\u011fini g\u00f6sterdi.<\/p>\n
Tetrapodlar ya da di\u011fer deyi\u015fle d\u00f6rt-ayakl\u0131 hayvanlar, ilk defa g\u00fcn\u00fcm\u00fczden 395 milyon y\u0131l \u00f6nce karada y\u00fcr\u00fcmeye ba\u015flad\u0131lar. Bu \u00f6nemli geli\u015fme kuvvetli kal\u00e7a kemiklerinin ve omurga ile ba\u011flant\u0131n\u0131n geli\u015fmesi sonucu ortaya \u00e7\u0131kt\u0131. Bu \u00f6zellikler tetrapodlar\u0131n atalar\u0131 olan bal\u0131klarda bulunan \u00f6zellikler de\u011fildi.<\/p>\n
Evolution and Development<\/em> (Evrim ve Geli\u015fim) dergisinde yay\u0131mlanan ve Avustralyal\u0131 bilimci Dr. Catherine Boisvert\u2019in \u00f6nc\u00fcl\u00fc\u011f\u00fcnde s\u00fcrd\u00fcr\u00fclen \u00e7al\u0131\u015fmada insan\u0131n yak\u0131n akrabalar\u0131ndan olan baz\u0131 bal\u0131klar\u0131n kal\u00e7a yap\u0131lar\u0131 incelendi.<\/p>\n Ara\u015ft\u0131rmac\u0131lar, bal\u0131klar ile bizim aram\u0131zda g\u00f6r\u00fcnd\u00fc\u011f\u00fc kadar \u00e7ok fark olmad\u0131\u011f\u0131 sonucuna ula\u015ft\u0131lar. \u0130nsan kal\u00e7alar\u0131na d\u00f6n\u00fc\u015f\u00fcm i\u00e7in gerekli bir\u00e7ok kilit element bal\u0131k atalar\u0131m\u0131zda zaten vard\u0131.<\/p>\n Ara\u015ft\u0131rma ekibi Avustralya akci\u011ferli bal\u0131klar\u0131 ile Axolotl (Meksikan\u0131n y\u00fcr\u00fcyen bal\u0131klar\u0131) kal\u00e7a yap\u0131lar\u0131n\u0131n -kemik ve kaslar\u0131n- \u00a0geli\u015fimlerini kar\u015f\u0131la\u015ft\u0131rd\u0131. Sonu\u00e7lar s\u00fcrpriz bir \u015fekilde, basit bal\u0131k kal\u00e7a yap\u0131s\u0131ndan hayvanlar\u0131n a\u011f\u0131r y\u00fckleri ta\u015f\u0131yan kal\u00e7a yap\u0131s\u0131na geli\u015fim s\u00fcrecinin sadece birka\u00e7 evrimsel ad\u0131mda ger\u00e7ekle\u015febilece\u011fini g\u00f6steriyor.<\/p>\n Tetrapodlarda ortaya \u00e7\u0131kt\u0131\u011f\u0131 d\u00fc\u015f\u00fcn\u00fclen bir\u00e7ok kas\u0131n akci\u011fer bal\u0131klar\u0131nda var olan kaslardan evrildikleri ortaya \u00e7\u0131kt\u0131. Ekip ayn\u0131 zamanda iskelet yap\u0131s\u0131n\u0131n evrilmi\u015f olabilece\u011fi \u00e7ok daha basit yollar ortaya \u00e7\u0131kard\u0131lar.<\/p>\n Ara\u015ft\u0131rmac\u0131lar oturma kemiklerinin var olan kas\u0131k kemiklerinin uzant\u0131s\u0131 olarak evrimle\u015fti\u011fini ortaya koydular. Omur kolonuna olan ba\u011flant\u0131n\u0131n ise bal\u0131klarda bulunan iliaktan (kal\u00e7a kemi\u011fi) evrimle\u015fmi\u015f olabilece\u011fini ortaya koydular.<\/p>\n Dr. Boisvert ara\u015ft\u0131rma hakk\u0131nda \u015f\u00f6yle konu\u015ftu: \u201cOkyanustan karalara ge\u00e7i\u015f, insanlar\u0131n da dahil oldu\u011fu kara hayvanlar\u0131n\u0131n evriminde \u00e7ok \u00f6nemli ad\u0131mlardan biriydi. Bu geli\u015fmede de de\u011fi\u015fmi\u015f ve geli\u015fmi\u015f bir kal\u00e7a yap\u0131s\u0131 gerekli bir ad\u0131md\u0131. Ara\u015ft\u0131rmam\u0131z morfolojide meydana gelen b\u00fcy\u00fck de\u011fi\u015fikli\u011fin g\u00f6rece olarak \u00e7ok daha az evrimsel ad\u0131mda ger\u00e7ekle\u015febilece\u011fini g\u00f6sterdi.\u201d<\/p>\n Kaynak:<\/strong> http:\/\/www.sciencedaily.com\/releases\/2013\/05\/130514101501.htm<\/p>\n","protected":false},"excerpt":{"rendered":" Yeni yay\u0131mlanan bir ara\u015ft\u0131rma, y\u00fcr\u00fcyen hayvanlar\u0131n karma\u015f\u0131k kal\u00e7a yap\u0131s\u0131n\u0131n bal\u0131klardaki basit kal\u00e7a yap\u0131s\u0131ndan evrimle\u015fme s\u00fcrecinin, daha \u00f6nceleri d\u00fc\u015f\u00fcn\u00fcld\u00fc\u011f\u00fcnden \u00e7ok daha basit bir \u015fekilde ger\u00e7ekle\u015fti\u011fini g\u00f6sterdi. Tetrapodlar ya da di\u011fer deyi\u015fle d\u00f6rt-ayakl\u0131 hayvanlar, ilk defa g\u00fcn\u00fcm\u00fczden 395 milyon y\u0131l \u00f6nce karada y\u00fcr\u00fcmeye ba\u015flad\u0131lar. Bu \u00f6nemli geli\u015fme kuvvetli kal\u00e7a kemiklerinin ve omurga ile ba\u011flant\u0131n\u0131n geli\u015fmesi sonucu ortaya […]<\/p>\n","protected":false},"author":293,"featured_media":41803,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[149,19,38,32],"tags":[6076,200,6075,984,6074],"class_list":["post-41802","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-112-sayi","category-bilim-gundemi","category-dergi-sayilari","category-evrim","tag-baliksi","tag-evrim","tag-kalca","tag-okyanus","tag-tetrapodlar"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/41802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/users\/293"}],"replies":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/comments?post=41802"}],"version-history":[{"count":0,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/posts\/41802\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media\/41803"}],"wp:attachment":[{"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/media?parent=41802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/categories?post=41802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bilimvegelecek.com.tr\/index.php\/wp-json\/wp\/v2\/tags?post=41802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}