英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2009-12-10

时间:2010-05-19 06:15来源:互联网 提供网友:mark@li   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

Little girls are made of sugar and spice and, according to a study published in the journal Cell, a fierce determination to maintain their girlishness. Because it seems that a single gene1 keeps their ovaries from turning into testes. 

Scientists have long thought that the ovary is the default setting for developing sex organs. That’s because the male Y chromosome2 comes equipped with a so-called sex determination gene called SRY. If SRY is missing, the gonad develops into an ovary, even if the embryo3 is male. Add SRY to a female embryo, it’ll make testes. But the new work implies that sex determination is not that simple. 

Okay, buckle4 up. See, the SRY gene makes a male by turning on another gene called Sox9. But it turns out that females have a trump5 card called FOX L2. FOX L2 switches off Sox9, which lets ovaries be ovaries. The surprise is that girls have to keep the FOX L2 gene active forever. In studies of mice, if FOX L2 gets shut off, even in an adult, the ovaries will turn into testes. Which for a girl means ball game over.

—Karen Hopkin

 


点击收听单词发音收听单词发音  

1 gene WgKxx     
n.遗传因子,基因
参考例句:
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
2 chromosome 7rUzX     
n.染色体
参考例句:
  • Chromosome material with exhibits of such behaviour is called heterochromatin.表现这种现象的染色体物质叫做异染色质。
  • A segment of the chromosome may become lost,resulting in a deletion.染色体的一个片段可能会丢失,结果产生染色体的缺失。
3 embryo upAxt     
n.胚胎,萌芽的事物
参考例句:
  • They are engaging in an embryo research.他们正在进行一项胚胎研究。
  • The project was barely in embryo.该计划只是个雏形。
4 buckle zsRzg     
n.扣子,带扣;v.把...扣住,由于压力而弯曲
参考例句:
  • The two ends buckle at the back.带子两端在背后扣起来。
  • She found it hard to buckle down.她很难专心做一件事情。
5 trump LU1zK     
n.王牌,法宝;v.打出王牌,吹喇叭
参考例句:
  • He was never able to trump up the courage to have a showdown.他始终鼓不起勇气摊牌。
  • The coach saved his star player for a trump card.教练保留他的明星选手,作为他的王牌。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   SSS  determination
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴