{"id":17576,"date":"2025-09-13T00:00:30","date_gmt":"2025-09-13T00:00:30","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=17576"},"modified":"2025-09-13T00:00:30","modified_gmt":"2025-09-13T00:00:30","slug":"the-evolution-of-bipedalism-in-hominids","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/hu\/science\/evolution\/the-evolution-of-bipedalism-in-hominids\/","title":{"rendered":"A k\u00e9tl\u00e1bon j\u00e1r\u00e1s titka: Hogyan lett\u00fcnk emberek?"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Emberr\u00e9 v\u00e1lni: A k\u00e9tl\u00e1bon j\u00e1r\u00e1s evol\u00faci\u00f3ja<\/h2>\n\n<h2 class=\"wp-block-heading\">A hominid\u00e1k meghat\u00e1roz\u00f3 von\u00e1sa<\/h2>\n\n<p>A k\u00e9tl\u00e1bon j\u00e1r\u00e1s, azaz a k\u00e9t l\u00e1bon t\u00f6rt\u00e9n\u0151 egyenes testtart\u00e1s\u00fa j\u00e1r\u00e1s k\u00e9pess\u00e9ge, a hominida-vonal meghat\u00e1roz\u00f3 jellemz\u0151je. Elk\u00fcl\u00f6n\u00edtette az els\u0151 hominid\u00e1kat a t\u00f6bbi n\u00e9gyl\u00e1b\u00fa majomt\u00f3l.<\/p>\n\n<h2 class=\"wp-block-heading\">A k\u00e9tl\u00e1bon j\u00e1r\u00e1s felfedez\u00e9se<\/h2>\n\n<p>A 20. sz\u00e1zad elej\u00e9n a tud\u00f3sok \u00fagy v\u00e9lt\u00e9k, hogy a nagy agyvel\u0151 teszi egyediv\u00e9 a hominid\u00e1kat. Azonban a Taung-i gyermek felfedez\u00e9se D\u00e9l-Afrik\u00e1ban az 1920-as \u00e9vekben megk\u00e9rd\u0151jelezte ezt a n\u00e9zetet. A Taung-i gyermek, kis aggyal, de emberihez hasonl\u00f3 foramen magnummal rendelkezett, ami arra utalt, hogy az egyenes j\u00e1r\u00e1s megel\u0151zte a nagy agyvel\u0151 fejl\u0151d\u00e9s\u00e9t az emberi evol\u00faci\u00f3ban.<\/p>\n\n<h2 class=\"wp-block-heading\">Fossz\u00edli\u00e1k bizony\u00edt\u00e9ka<\/h2>\n\n<p>A k\u00e9s\u0151bbi fossz\u00edli\u00e1k, mint p\u00e9ld\u00e1ul az australopithecusok \u00e9s Lucy, tov\u00e1bb t\u00e1mogatt\u00e1k azt az elk\u00e9pzel\u00e9st, hogy a k\u00e9tl\u00e1bon j\u00e1r\u00e1s megel\u0151zte a nagy agyvel\u0151t. A k\u00e9tl\u00e1bon j\u00e1r\u00e1s legkiterjedtebb bizony\u00edt\u00e9ka az Ardipithecus ramidusb\u00f3l sz\u00e1rmazik, egy majdnem teljes csontv\u00e1zb\u00f3l, amely 4,4 milli\u00f3 \u00e9vvel ezel\u0151ttr\u0151l sz\u00e1rmazik.<\/p>\n\n<h2 class=\"wp-block-heading\">Mi\u00e9rt fejl\u0151d\u00f6tt ki a k\u00e9tl\u00e1bon j\u00e1r\u00e1s?<\/h2>\n\n<p>Ami\u00e9rt a hominid\u00e1k k\u00e9tl\u00e1bon j\u00e1r\u00e1sra fejl\u0151dtek, tov\u00e1bbra is vita t\u00e1rgya. T\u00f6bb hipot\u00e9zist is felvetettek:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Darwin hipot\u00e9zise:<\/strong> A k\u00e9tl\u00e1bon j\u00e1r\u00e1s felszabad\u00edtotta a kezeket a szersz\u00e1mhaszn\u00e1latra \u00e9s a vad\u00e1szatra.<\/li>\n<li><strong>Lovejoy hipot\u00e9zise:<\/strong> A k\u00e9tl\u00e1bon j\u00e1r\u00e1s az \u00e9ghajlatv\u00e1ltoz\u00e1sra \u00e9s a h\u00edmek azon sz\u00fcks\u00e9glet\u00e9re v\u00e1laszul fejl\u0151d\u00f6tt ki, hogy \u00e9lelmet biztos\u00edtsanak a n\u0151st\u00e9nyek \u00e9s az ut\u00f3dok sz\u00e1m\u00e1ra.<\/li>\n<li><strong>Rodman \u00e9s McHenry hipot\u00e9zise:<\/strong> A k\u00e9tl\u00e1bon j\u00e1r\u00e1s energetikailag el\u0151ny\u00f6ss\u00e9 v\u00e1lt, amikor a hominid\u00e1k lesz\u00e1lltak a f\u00e1kr\u00f3l, \u00e9s elkezdek a ny\u00edlt f\u00fcves ter\u00fcleteken j\u00e1rk\u00e1lni.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">A k\u00e9tl\u00e1bon j\u00e1r\u00e1s eredete<\/h2>\n\n<p>A legkor\u00e1bbi ismert k\u00e9tl\u00e1b\u00fa majmok a Sahelanthropus tchadensis \u00e9s az Orrorin tugenensis, amelyek k\u00f6r\u00fclbel\u00fcl h\u00e9t \u00e9s hat milli\u00f3 \u00e9vvel ezel\u0151ttre dat\u00e1lhat\u00f3k. Azonban a k\u00e9tl\u00e1bon j\u00e1r\u00f3 mivoltuk m\u00e9g mindig vitatott.<\/p>\n\n<h2 class=\"wp-block-heading\">A k\u00e9tl\u00e1bon j\u00e1r\u00e1s hat\u00e1sa<\/h2>\n\n<p>A k\u00e9tl\u00e1bon j\u00e1r\u00e1s m\u00e9ly hat\u00e1ssal volt az emberi anat\u00f3mi\u00e1ra. V\u00e1ltoz\u00e1sokat eredm\u00e9nyezett a medenc\u00e9ben, a combcsontokban \u00e9s a gerincben, hogy t\u00e1mogassa az egyenes testtart\u00e1st \u00e9s a hat\u00e9kony j\u00e1r\u00e1st. A k\u00e9tl\u00e1bon j\u00e1r\u00e1s a kezeket is felszabad\u00edtotta m\u00e1s feladatokhoz, hozz\u00e1j\u00e1rulva a szersz\u00e1mhaszn\u00e1lat \u00e9s a technol\u00f3gia fejl\u0151d\u00e9s\u00e9hez.<\/p>\n\n<h2 class=\"wp-block-heading\">Az \u00e1t\u00e1ll\u00e1s a sz\u00e1razf\u00f6ldi \u00e9letre<\/h2>\n\n<p>B\u00e1r a legkor\u00e1bbi hominid\u00e1k k\u00e9pesek voltak egyenesen j\u00e1rni, m\u00e9g mindig meg\u0151rizt\u00e9k az \u0151si von\u00e1sokat, mint p\u00e9ld\u00e1ul a hossz\u00fa, \u00edvelt ujjakat \u00e9s l\u00e1bujjakat, ami arra utal, hogy id\u0151t t\u00f6lt\u00f6ttek a f\u00e1kon. Csak a Homo erectus k\u00f6r\u00fclbel\u00fcl 1,89 milli\u00f3 \u00e9vvel ezel\u0151tti megjelen\u00e9s\u00e9vel v\u00e1ltak a hominid\u00e1k teljesen sz\u00e1razf\u00f6ldi l\u00e9nyekk\u00e9, magas testalkattal \u00e9s hossz\u00fa l\u00e1bakkal.<\/p>\n\n<h2 class=\"wp-block-heading\">A v\u00e1laszok keres\u00e9se<\/h2>\n\n<p>Annak ellen\u00e9re, hogy a k\u00e9tl\u00e1bon j\u00e1r\u00e1s evol\u00faci\u00f3j\u00e1nak meg\u00e9rt\u00e9s\u00e9ben el\u0151rel\u00e9p\u00e9s t\u00f6rt\u00e9nt, a k\u00e9rd\u00e9s, hogy a hominid\u00e1k mi\u00e9rt tett\u00e9k meg els\u0151 k\u00e9tl\u00e1b\u00fa l\u00e9p\u00e9seiket, tov\u00e1bbra is megv\u00e1laszolatlan. A paleoantropol\u00f3gusok tov\u00e1bbra is t\u00f6bb fosszilis bizony\u00edt\u00e9kot keresnek, hogy f\u00e9nyt der\u00edtsenek erre a kulcsfontoss\u00e1g\u00fa esem\u00e9nyre az emberi evol\u00faci\u00f3ban.<\/p>","protected":false},"excerpt":{"rendered":"<p>Emberr\u00e9 v\u00e1lni: A k\u00e9tl\u00e1bon j\u00e1r\u00e1s evol\u00faci\u00f3ja A hominid\u00e1k meghat\u00e1roz\u00f3 von\u00e1sa A k\u00e9tl\u00e1bon j\u00e1r\u00e1s, azaz a k\u00e9t l\u00e1bon t\u00f6rt\u00e9n\u0151 egyenes testtart\u00e1s\u00fa j\u00e1r\u00e1s k\u00e9pess\u00e9ge, a hominida-vonal meghat\u00e1roz\u00f3 jellemz\u0151je. Elk\u00fcl\u00f6n\u00edtette az els\u0151 hominid\u00e1kat&hellip;<\/p>\n","protected":false},"author":2,"featured_media":24942,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1327],"tags":[23091,1738,22878,19903,2949,1906,23092,1568],"class_list":["post-17576","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evolution","tag-ardipithecus-ramidus","tag-human-origins","tag-evolutionary-adaptations","tag-hominid-evolution","tag-homo-erectus","tag-bipedalism","tag-lucy","tag-paleoanthropology"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/17576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/comments?post=17576"}],"version-history":[{"count":2,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/17576\/revisions"}],"predecessor-version":[{"id":24943,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/posts\/17576\/revisions\/24943"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/media\/24942"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/media?parent=17576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/categories?post=17576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/hu\/wp-json\/wp\/v2\/tags?post=17576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}