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SSS 2009-03-20

时间:2010-05-17 06:42来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

 

Some people are worried that the more we learn about genetics, the closer we’ll get to a day when we can choose all sorts of characteristics for our babies: eye color, intelligence—and sex. Well, when it comes to sex, finches are a step ahead of us. Researchers in Australia show that female Gouldian finches can select the sex of their offspring. They published their research in the March 20th edition of the journal Science.

 

Gouldian finches have either red or black colorations on their heads. They choose their mate based on that head color. So researchers played a trick on the animals. They painted the heads of some red males black. Then they mated those seemingly black-headed birds with both red and black females. When the black females thought they were mating with a black male, they produced equal number of baby girl and boy birds.

 

But the red finch1 females who thought they were mating with an incompatible2 black-headed male had significantly more baby boys. Researchers say this is probably to reduce investment in what they call ‘inviable females.’ And they had fewer and smaller eggs. Truly a clutch performance.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 finch TkRxS     
n.雀科鸣禽(如燕雀,金丝雀等)
参考例句:
  • This behaviour is commonly observed among several species of finch.这种行为常常可以在几种雀科鸣禽中看到。
  • In Australia,it is predominantly called the Gouldian Finch.在澳大利亚,它主要还是被称之为胡锦雀。
2 incompatible y8oxu     
adj.不相容的,不协调的,不相配的
参考例句:
  • His plan is incompatible with my intent.他的计划与我的意图不相符。
  • Speed and safety are not necessarily incompatible.速度和安全未必不相容。
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TAG标签:   SSS  coloration
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