久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

  Home>News Center>Life
         
 

Gene change alters sex orientation in flies
(Agencies)
Updated: 2005-06-05 10:40

NEW YORK - Altering a single gene in a fruit fly can turn its sexual orientation around, causing male flies to lose interest in females, and females to display male mating rituals to other females, according to a study published in the journal Cell on Friday.

The research by Barry J. Dickson and Ebru Demir of the Institute of Molecular Biotechnology of the Austrian Academy of Sciences into the workings of a "switch gene" touched on the scientific debate about whether genes or environment determine human sexual orientation.

Male courtship in Drosophila is an elaborate ritual and largely a fixed-action pattern easily identified by the researchers.

The male taps the female with his forelegs, sings a specific courtship song by extending and vibrating a wing, licks her genitalia, and then curls his abdomen for copulation.

Through gene splicing, they were able to swap the orientation of male and female fruit flies they studied in an observation chamber.

"Forcing female splicing in the male results in a loss of male courtship behavior and orientation," the study said. "More dramatically, females ... spliced in the male mode behave as if they were males: they court other females.

"A complex innate behavior is thus specified by the action of a single gene, demonstrating that behavioral switch genes do indeed exist."

Female flies with the male version of the gene also made amorous advances toward male flies expressing female pheromones, while altered male flies were more likely to court other males.

"We have been able to reverse the sex roles during Drosophila courtship," the scientists said.

So-called "switch genes" that trigger development of an anatomical feature such as wing structure have been extensively studied, but there a few studies of switch genes that control a complex behavior, the researchers said.

The researchers said they have already begun work with other scientists to test for switch genes that might be linked to other behavioral patterns like aggression.



'Pigball' competition near Moscow
Miss Canada Natalie Glebova wins Miss Universe title
Britney, Kevin need viewers
  Today's Top News     Top Life News
 

Singapore PM: Containing China is short-sighted

 

   
 

China moves to regulate organ transplant

 

   
 

Wu Yi: Textile issue China's top concern

 

   
 

US senator opposes tariff bill against China

 

   
 

China urges SCO unity, cooperation

 

   
 

Marines find weapons caches, huge bunker

 

   
  Four slain newborns discovered in Austria
   
  Shoes made for Thatcher go on sale on auction website
   
  Jackson jurors begin weighing fate of pop star
   
  125 large northern lakes disappear
   
  British police arrest pair over stolen Harry Potter book
   
  A sexual revolution silently going on in China
   
 
  Go to Another Section  
 
 
  Story Tools  
   
  Feature  
  1/3 Chinese youth condone premarital sex  
Advertisement
         
主站蜘蛛池模板: 91久久99热青草国产 | 久草在线在线 | 欧美成人看片一区二区三区 | 99精品在线观看视频 | 日本综合欧美一区二区三区 | 国产免费一区二区三区在线 | 一级做性色a爰片久久毛片 一级做性色a爰片久久毛片免费 | av片免费大全在线观看不卡 | 国产精品成人网 | 91porny九色国产首页在线 | 国产成人精品一区二区三在线观看 | 日韩精品免费一区二区 | 国产成人在线视频 | 日韩一级在线播放免费观看 | 欧美另类专区 | 国产三级视频在线 | 亚洲第一免费网站 | 国产精品18久久久久久vr | 精品国产一区二区三区不卡 | 精品一区二区三区四区在线 | 国产亚洲欧美一区 | 香港日本韩国三级网站 | 精品国产成人在线 | 亚洲国产午夜看片 | 寂寞午夜影院 | 国产成人99久久亚洲综合精品 | 亚洲黄色免费观看 | 美女很黄很黄 | 免费看岛国视频在线观看 | 亚洲成人影院在线观看 | 国产精品blacked在线 | 欧美高清性刺激毛片 | 日韩精品网址 | 日韩精品在线免费观看 | 91av福利| 久久久久久久久久久视频国内精品视频 | 成人18网址在线观看 | 香蕉久| 巨大热杵在腿间进进出出视频 | 中文字幕在线观看网址 | 大陆高清自拍 |