东方人的发丝比西方人粗与EDAR基因有关 - 未名空间MITBBS历史存档

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东方人的发丝比西方人粗与EDAR基因有关

东方人的发丝比西方人粗与EDAR基因有关# Biology - 生物学

w*n2011-01-12 08:01

1 楼

父母开了一家小商店，已经十多年了
请问填160的occupation时应该怎么填？ employer是不是写self－employed呢？
previous work不用填吧？
谢谢了！～

b*e2011-01-12 08:01

2 楼

给你24小时时间补过道歉
哼哼

d*32011-01-12 08:01

3 楼

《中国好声音》第二季进入导师组4进1环节，那英组比赛高开低走在一片哗然声中
戛然而止，好声音第二季舞台上人气实力均爆棚的姚贝娜最终不敌萱萱，究竟青歌赛冠
军为何难敌一名连快女30强都进不去的学员？究竟灿星是否绑架了好声音而姚贝娜成为
最终牺牲品？依照两人的人气指数，姚贝娜vs萱萱媒体评审为何会差距如此悬殊？我们
回顾一下那英组4进1那些争议点：姚贝娜赛后被曝歌单其实在赛前一再被换，原本已经
连熟的歌曲一一好声音导演组否决，还强加一首难驾驭的英文歌《All by myself》，
难怪比赛中姚贝娜要话里有话讥讽那英，而最终的“姚那甩手门”也在情理之中；萱萱
最终夺得那英组冠军，不仅要感谢歌单的照顾就连歌曲演唱顺序都有很多讲究，《叶子
》、《你是不是我最疼爱的人》皆为低音key歌曲，而姚贝娜再演唱2首高难度歌曲后还
要演唱自己不擅长的英文歌曲，田忌赛马的陷阱想不中都难！赛后姚贝娜临阵被黑也成
为微博热议话题，好声音上一季同病相怜的关喆也在第一时间力挺姚贝娜，而同为淘汰
者的朱克、侯磊惨成路人无人问津。

f*l2011-01-12 08:01

4 楼

网上比较受欢迎的一些小说，都是两三百万的字数，而且有的情节还没有进行到一半。
想想金庸的《倚天》，《笑傲》之类的，不过百万字。所以，个人觉得写这么长没有必
要。长篇小说写得好，写得尽量精悍比写得长难。起点，纵横还有创始应该另外定一个
更合理稿酬标准，不要以字数来算。不然很多作者写起来拖沓冗长，王大娘的裹脚，又
臭又长。让很多读者捏着鼻子看。

g*d2011-01-12 08:01

5 楼

发表在基因图谱年会的一项跨文化研究指出，东方人的发丝比西方人粗50％的现象
和一段EDAR
基因有关.
SAN DIEGO, CALIFORNIA--Whether you have a poker-straight black mane
or frizzy blond locks, your hair depends on your ancestry. Now
researchers have come closer to figuring out just how hair traits are
passed down. According to a talk presented here last week at the annual
meeting of the American Society of Human Genetics, a single genetic
variant may explain why East Asians have thicker hair fibers than other
populations. The discovery is part of a wave of newly found genes that
determine what individuals look like.
Anthropologists have long noticed that populations across the world
differ in hair type, skin color, and facial features. Finding the genes
that explain these differences became easier in 2005, when researchers
unveiled the International HapMap Project, a catalog of human genetic
variation that helps scientists home in on genes more quickly
(ScienceNOW, 26 October 2005). Geneticists at the University of Tokyo
and several other institutions in Japan, Thailand, and Indonesia have
now used the HapMap to explore why Japanese and Chinese people have
thick hair: The cross-sectional area of East Asian hair fibers averages
about 30% larger than that of Africans and 50% larger than that of
Europeans.
The researchers started with 170 candidate genes known to be
involved in hair development based on mouse studies and rare inherited
human diseases. They then narrowed this list by looking at how these
genes varied in three HapMap populations--Yoruba from Nigeria,
Europeans, and Japanese and Chinese. A variant in a gene called EDAR was
present in 88% of the Japanese and Chinese but not at all in the two
other groups. To see how this gene affected hair thickness, the
researchers examined hair fiber dimensions and DNA from 186 individuals
from two ethnic groups in Southeast Asia who have a variety of hair
types. Hair fibers were thickest in people who have two copies of the
East Asian version of EDAR.
The EDAR gene codes for ectodysplasin A receptor, which is part of a
molecular pathway that signals hair precursor cells to begin forming a
follicle. The variant may have been selected for in East Asians either
because thicker hair was beneficial in the cold north Asian climate or
because it is linked to some other trait, such as tooth shape, that gave
East Asians an advantage, concluded presenter Akihiro Fujimoto of the
University of Tokyo.
The EDAR allele wouldnt be all that useful for figuring out what
someone looks like from their DNA because it doesnt determine whether
hair is straight or curly, and hair thickness also varies with sex and
age, says co-author Ryosuke Kimura of Tokai University School of
Medicine in Kanagawa, Japan. However, he says it could be used as a
marker for East Asian ancestry. Indeed, notes molecular anthropologist
Mark Shriver of Pennsylvania State University in State College, the EDAR
allele had already jumped out in the HapMap analysis as being distinctly
East Asian. "It was only a matter of time before somebody focused in on
what the phenotype was," he says.
And more genes for physical traits are coming. At the same session,
researchers from Iceland and the Netherlands described several newly
discovered genes that contribute to eye and hair color--and freckling--
in Europeans. The finding, published online last week in Nature
Genetics, and others like it could be useful for investigating crime, as
well as for genetic anthropology, notes co-author, CEO of deCODE
genetics in Iceland. For example, knowing the gene for red hair allowed
researchers to report last week that some Neandertals were redheads
(Science, 26 October). Using such traits for DNA forensics "is clearly
where we are headed," says Shriver.
http://www.uscnlife.cn/web/page/news1102.htm

N*O2011-01-12 08:01

6 楼

就填self－employed。
previous work是填5年内的之前的工作吧，也不用填了。

m*o2011-01-12 08:01

7 楼

要批吗

w*e2011-01-12 08:01

8 楼

哈林也是个垃圾。

o*l2011-01-12 08:01

9 楼

网络写手是靠字数拿钱的
这么多拖戏的就是为了多拿钱
搞上限这帮人不疯了

【在 f********l 的大作中提到】

: 网上比较受欢迎的一些小说，都是两三百万的字数，而且有的情节还没有进行到一半。
: 想想金庸的《倚天》，《笑傲》之类的，不过百万字。所以，个人觉得写这么长没有必
: 要。长篇小说写得好，写得尽量精悍比写得长难。起点，纵横还有创始应该另外定一个
: 更合理稿酬标准，不要以字数来算。不然很多作者写起来拖沓冗长，王大娘的裹脚，又
: 臭又长。让很多读者捏着鼻子看。