Re: [轉錄]Re: [新聞] 暴龍演化成雞? 有影!
看板media-chaos作者xanthomonas (campestris)時間17年前 (2007/04/17 02:33)推噓19(19推 0噓 177→)留言196則, 3人參與討論串5/5 (看更多)
→ alcoholic:奉勸你不懂最好不要亂講 04/16 11:56
推 alcoholic:就算是RNA或是蛋白質定序出來以後也會返回去用DNA分析 04/16 11:57
→ alcoholic:你這句話講那麼快可能嗆死一堆教授 04/16 11:58
推 kaikai1112:如果你有一段 銨基酸序列 你會直接用來比對 04/16 13:29
→ kaikai1112:還是你會用 銨基酸序列倒推出來的 DNA 分析 04/16 13:30
→ kaikai1112:這不就像在脫褲子放屁一樣 沒事找事 04/16 13:32
→ kaikai1112:更別說 推出來 DNA 序列組 會有 degeneracy 的問題 04/16 13:33
→ kaikai1112:啥 你不知到 degeneracy 是啥 那就別在這裡充內行了 04/16 13:35
→ kaikai1112:你不知道 同樣的銨基酸序列 會有數十到數百組 可能的 04/16 13:37
→ kaikai1112:對應 DNA 序列 去看看 分子生物學吧 ㄚ宅 別嘴砲了 04/16 13:39
推 nightcatman:樓上才是在充內行吧...聽了幾堂課的大學生程度... 04/16 15:52
→ nightcatman:當在做演化分析的時候,尤其親緣關係很遠的物種,aa序列 04/16 15:53
→ nightcatman:的相似度不會太高,找出來的可能是假訊號,因此還是會再 04/16 15:56
→ nightcatman:回去做6個ORF的DNA比對,確認基因在genome上的位置, 04/16 15:58
→ nightcatman:然後觀察在coding region前後必要的訊號是否有出現, 04/16 16:01
→ nightcatman:如果都找到了,才能確定這個相似性是可信的 04/16 16:03
→ nightcatman:簡而言之,比對aa序列只是第一步,因為它的sensitivity 04/16 16:09
→ nightcatman:比較高,可以找到微弱訊號,但同時找到偽訊號的機率也高 04/16 16:11
→ nightcatman:所以還是要再做DNA比對來確認基因的結構是否完整 04/16 16:18
根據
http://www.sciencedaily.com/releases/2007/04/070412140942.htm
"The protein fragments in the T. rex fossil appear to most closely match "
"amino acid sequences found in collagen of present-day chickens, lending "
"support to the idea that birds and dinosaurs are evolutionarily related."
這項研究是用氨基酸序列比對!!!!!!
-----------------------------
聯合新聞網
http://tw.news.yahoo.com/article/url/d/a/070413/2/cw9c.html
"終於為膠質蛋白質內的氨基酸排序成功,進行DNA分析。"
這後半句,沒有事實根據.......
大概是記者自己分析的........
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