{"id":92216,"date":"2023-05-18T10:23:06","date_gmt":"2023-05-18T10:23:06","guid":{"rendered":"https:\/\/haberulus.net\/?p=92216"},"modified":"2023-05-18T10:23:06","modified_gmt":"2023-05-18T10:23:06","slug":"bilimsel-arastirma-tarakli-denizanalari-tum-canlilarin-ortak-atasi-olabilir","status":"publish","type":"post","link":"https:\/\/haberulus.net\/?p=92216","title":{"rendered":"Bilimsel ara\u015ft\u0131rma: Tarakl\u0131 denizanalar\u0131 t\u00fcm canl\u0131lar\u0131n ortak atas\u0131 olabilir"},"content":{"rendered":"

ABD\u2019deki Kaliforniya \u00dcniversitesi\u2019nden ara\u015ft\u0131rmac\u0131lar, y\u0131llar s\u00fcren anla\u015fmazl\u0131\u011f\u0131n ard\u0131ndan, ikisinin aras\u0131nda ilk ortaya \u00e7\u0131kan canl\u0131lar\u0131n tarakl\u0131 denizanalar\u0131 oldu\u011funu ileri s\u00fcrd\u00fc.<\/p>\n

S\u00fcngerler basit, yerle\u015fik deniz canl\u0131lar\u0131 iken tarakl\u0131 denizanalar\u0131 da okyanuslarda y\u00fczen jelatinimsi damla benzeri organizmalard\u0131r. 500 milyon y\u0131ldan daha uzun bir s\u00fcre \u00f6nce, ikisinden biri atalar\u0131n\u0131n soyundan ayr\u0131lan ve evrim a\u011fac\u0131nda kendi dal\u0131n\u0131 olu\u015fturan ilk hayvan t\u00fcr\u00fc oldu.<\/span><\/p>\n

Hangisinin daha \u00f6nce geldi\u011fi \u00fczerine, uzun s\u00fcredir devam eden tart\u0131\u015fmalar bulunuyordu. Nature dergisinde yay\u0131nlanan ara\u015ft\u0131rma, denizanalar\u0131n\u0131n, t\u00fcm hayvanlar\u0131n atas\u0131 olarak g\u00f6r\u00fclebilece\u011fini vurgulad\u0131.<\/p>\n

\"\"<\/p>\n

KASLARI VE S\u0130N\u0130R H\u00dcCRELER\u0130 VAR<\/b><\/p>\n

Times\u2019ta yer alan habere g\u00f6re, denizanas\u0131 dal\u0131n\u0131n ayr\u0131ld\u0131\u011f\u0131 evrimsel \u201cg\u00f6vde\u201d, daha sonra, bug\u00fcn hala var olan di\u011fer d\u00f6rt ana hayvan soyuna b\u00f6l\u00fcnd\u00fc: s\u00fcngerler, mikroskobik d\u00fcz hayvanlar, cnidarians (anemonlar, denizanas\u0131 ve hidra gibi) ve bilateriler (insanlar\u0131n yan\u0131 s\u0131ra yumu\u015fak\u00e7alar, eklembacakl\u0131lar ve solucanlar).<\/span><\/p>\n

Ara\u015ft\u0131rmada, \u00e7e\u015fitli hayvanlar\u0131n kromozomlar\u0131na, h\u00fccrelerinin \u00e7ekirde\u011finde bulunan, genlerini ta\u015f\u0131yan ve DNA\u2019dan olu\u015fan iplik benzeri yap\u0131lara bak\u0131ld\u0131. Bulgular, bilim insanlar\u0131n\u0131n t\u00fcm hayvanlar\u0131n atalar\u0131n\u0131n neye benzedi\u011fine dair daha net bir resim olu\u015fturmas\u0131na olanak tan\u0131yacak. Bu \u00e7ok erken canl\u0131lara ait \u00e7ok az fosil var. Ancak, tarakl\u0131 denizanalar\u0131n\u0131n kaslar\u0131 ve n\u00f6ronlar\u0131 (sinir h\u00fccreleri) oldu\u011funu, s\u00fcngerlerin ise olmad\u0131\u011f\u0131 biliniyor.<\/span><\/p>\n

14 GEN GRUBU BULUNDU<\/b><\/p>\n

Ara\u015ft\u0131rmac\u0131lar, n\u00f6ronlar\u0131 ve kaslar\u0131 olan t\u00fcm hayvanlar\u0131n, bu \u00f6zelliklere de sahip olan ortak bir ataya sahip olduklar\u0131n\u0131 varsayman\u0131n mant\u0131kl\u0131 oldu\u011funu iddia ediyor.<\/span><\/p>\n

Analiz, tarakl\u0131 denizanalar\u0131n\u0131n kromozomlar\u0131 ile yakla\u015f\u0131k bir milyar y\u0131l \u00f6nce ortak bir atay\u0131 payla\u015fan ilkel tek h\u00fccreli organizmalar\u0131n kromozomlar\u0131 aras\u0131ndaki \u00f6nemli benzerlikleri ortaya \u00e7\u0131kard\u0131. Her birinde, her biri ayr\u0131 kromozomlarda bulunan 14 gen grubu vard\u0131.<\/span><\/p>\n

S\u00fcngerler de dahil olmak \u00fczere di\u011fer t\u00fcm hayvan soylar\u0131nda, bu 14 gen grubu yeniden d\u00fczenlendi ve \u015fimdi yedi grup olu\u015fturuyor. Ara\u015ft\u0131rmac\u0131lar bunun, bu canl\u0131lar\u0131n ortak bir atas\u0131nda ger\u00e7ekle\u015fmi\u015f olmas\u0131 gerekti\u011fini savunuyorlar.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Yay\u0131nlanan bir ara\u015ft\u0131rma, denizanas\u0131n\u0131n m\u0131 yoksa deniz s\u00fcngerinin mi daha \u00f6nce geldi\u011fi konusuna \u0131\u015f\u0131k tuttu.<\/p>\n","protected":false},"author":1,"featured_media":92217,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[11986,244],"class_list":["post-92216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-teknoloji","tag-denizanalari","tag-hayvan"],"_links":{"self":[{"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/posts\/92216","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haberulus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=92216"}],"version-history":[{"count":1,"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/posts\/92216\/revisions"}],"predecessor-version":[{"id":92218,"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/posts\/92216\/revisions\/92218"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/haberulus.net\/index.php?rest_route=\/wp\/v2\/media\/92217"}],"wp:attachment":[{"href":"https:\/\/haberulus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=92216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haberulus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=92216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haberulus.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=92216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}