{"id": "8UEe8kFLDSY", "uploader": "UiO Realfagsbiblioteket", "uploader_id": "realfagsbiblioteket", "uploader_url": "http://www.youtube.com/user/realfagsbiblioteket", "channel_id": "UCynaukrA8wxvJOcyFQJN3Jg", "channel_url": "http://www.youtube.com/channel/UCynaukrA8wxvJOcyFQJN3Jg", "upload_date": "20160128", "license": "Creative Commons Attribution license (reuse allowed)", "creator": null, "title": "BIO-torsdag: Hvordan nye arter kan oppst\u00e5 over natten", "alt_title": null, "thumbnail": "https://i.ytimg.com/vi/8UEe8kFLDSY/maxresdefault.jpg", "description": "Anne Krag Brysting ble k\u00e5ret til \u00e5rets foreleser av studentene p\u00e5 MN-fakultetet i 2015. P\u00e5 \u00e5rets f\u00f8rste BIO-torsdag snakker hun om sin forskning.\n\nVi tenker ofte p\u00e5 artsdannelse som en prosess som kan ta tusenvis av \u00e5r, som et resultat av opphoping av mange sm\u00e5 genetiske endringer (mutasjoner) og tilpasning til lokale milj\u00f8forhold.  Det er god grunn til at tro at mye av evolusjonen som har f\u00f8rt frem til dagens biologiske mangfold har foreg\u00e5tt p\u00e5 denne m\u00e5ten. Hos planter er det imidlertid ogs\u00e5 vanlig med en annen form artsdannelse som gj\u00f8r at nye arter kan oppst\u00e5 i l\u00f8pet av en enkel eller noen f\u00e5 generasjoner. En ny art kan oppst\u00e5 som et resultat av at to andre arter krysser seg med hverandre (hybridisering). Normalt vil en slik krysning ikke resultere i levedyktig eller fruktbart avkom og vil derfor ende opp som ingenting, men hvis hybridiseringen skjer i kombinasjon med kromosomfordobling (polyploidisering) kan en ny art i bokstavelig forstand oppst\u00e5 'over natten'. Og slike polyploide arter med fordoblet kromosomtall er faktisk en viktig del av v\u00e5r hverdag: St\u00f8rstedelen av landbruksproduksjonen - mat, f\u00f4r og fibre - kommer fra polyploide arter. Og samtidig er mange av de verste invaderende planter i verden polyploide arter.\n\nhttp://www.ub.uio.no/om/aktuelt/arrangementer/ureal/science-debate/2016/160128-biotorsdag.html", "categories": ["Education"], "tags": ["biotorsdag", "artsdannelse", "Anne Krag Brysting", "evolusjon"], "subtitles": {}, "automatic_captions": {}, "duration": 3292, "age_limit": 0, "annotations": null, "chapters": null, "webpage_url": "https://www.youtube.com/watch?v=8UEe8kFLDSY", "view_count": 526, "like_count": 0, "dislike_count": 0, "average_rating": 0.0, "formats": [{"format_id": "249", "url": "https://r2---sn-ovgq0oxu-5goe.googlevideo.com/videoplayback?mt=1546829836&mv=u&signature=55A28CB2C546F5810DB5770DEE7008AE81764B47.132EEF0430642A928116D3F80084F331C4B591E4&ms=au%2Crdu&c=WEB&mm=31%2C29&mn=sn-ovgq0oxu-5goe%2Csn-5go7yne6&clen=20654894&id=o-AM3_RvizE7cr5i9riWqGIbM38I4dPPqEJSVrJdNdWLCf&keepalive=yes&sparams=clen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&ei=TMQyXP65AsbK7ASgsb94&ip=2001%3A700%3A100%3A118%3A%3A26&source=youtube&gcr=no&dur=3291.941&pl=40&gir=yes&requiressl=yes&expire=1546852524&mime=audio%2Fwebm&key=yt6&fvip=2&itag=249&ipbits=0&lmt=1454429612076262&ratebypass=yes", "player_url": "/yts/jsbin/player_ias-vflWb9AD2/en_US/base.js", "ext": "webm", "format_note": "DASH audio", "acodec": "opus", "abr": 50, "filesize": 20654894, "tbr": 54.372, "quality": -1, "vcodec": "none", "downloader_options": {"http_chunk_size": 10485760}, "format": "249 - audio only (DASH audio)", "protocol": "https", "http_headers": {"User-Agent": "Mozilla/5.0 (X11; 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