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SSS 2011-12-27

时间:2012-01-13 05:55来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American's sixty seconds science, I'm Steve Mirsky. Got a minute?

The eastern green tree frog looks exactly like the close related cops gree tree frog, the big difference between the two species is beneath the surface. The eastern has twice the number of chromosomes2 as those of the cops. Having more size of chromosomes makes the cells of eastern frog larger than the cells found in the cops, and those bigger cells make the eastern's sound just a little deeper. Now University of Missouri researcher Crow G. and a student Mickey Tarker have determine that the slight difference in the calls here is the eastern again. And here is the cops. Is that the females know which species males * with the ones was the same chromosome1 number that they have. The work is in the Proceedings3 of the Royal Society B Biological Sciences. Speciation is often caused by a geographic4 barrier that keeps population from mating, but the tree frog situation maybe a rare case in which chromosome duplication and * presented a reproductive barrier. As a new man it comes down to wether they calls.
Thanks for the minute of Scientific American's sixty seconds science, I'm Steve Mirsky. 
This post was generated by put listening repetition system,  Check the original dictation thread!

点击收听单词发音收听单词发音  

1 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。
2 chromosomes 11783d79c0016b60332bbf1856b3f77d     
n.染色体( chromosome的名词复数 )
参考例句:
  • Chromosomes also determine the sex of animals. 染色体也决定动物的性别。 来自《简明英汉词典》
  • Each of four chromosomes divide longitudinally. 四种染色体的每一种都沿着纵向分裂。 来自《现代汉英综合大词典》
3 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
4 geographic tgsxb     
adj.地理学的,地理的
参考例句:
  • The city's success owes much to its geographic position. 这座城市的成功很大程度上归功于它的地理位置。 来自《简明英汉词典》
  • Environmental problems pay no heed to these geographic lines. 环境问题并不理会这些地理界限。 来自英汉非文学 - 环境法 - 环境法
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