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1个月前   sarajojo: When first discovered in Australia in 1798, the beaver-tailed animal caused such bemusement that the zoologist George Shaw declared it could well be a hoax. 1798年在澳大利亚第一次被发现时，这种尾巴像海狸的动物让人们如此困惑以致动物学家乔治-肖称它是个很好的 恶作剧。 1楼

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1个月前   ilywish: 1798年，在澳大利亚首次发现的海狸尾式动物引发了很大的困惑，动物学家乔治.肖称它很可能是一个骗局。 3楼

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1个月前   excit: (*^__^*) 嘻嘻……，沙发 8楼

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1个月前   xiaomao20067: 感谢上期参与本节目的同学，红包随后送出。 已经奖励 excit,ilywish,latary,ldmaria610,vincent985,wewea,ylx2008,zw0348,流浪在云朵上 单个用户操作：金钱60 10楼

1个月前   xiaomao20067: http://image.hjbbs.com/img/200805/200805094362731211.jpg At first dismissed as a prank, and later cited as proof that God has a sense of humour, the duck-billed platypus has finally given up its evolutionary secrets. The creature, considered one of the strangest mammals in the world, has become the latest to have its genetic code sequenced, revealing it to be a bizarre mix of mammal, bird and reptile, with very complex sexuality. While humans have two sex chromosomes, the X and Y, the platypus has 10, with five of each kind. An international team of scientists extracted DNA from a female platypus, named Glennie, reading all 2.2bn pairs of her genetic "letters". Thought to have begun to diverge from other mammals 170m years ago, the platypus has been regarded as the nearest thing biologists have to a missing link between the earliest reptiles and mammals. It has thick fur and produces milk for its young, yet the females lay eggs and the males produce venom - the only mammals to do so. When first discovered in Australia in 1798, the beaver-tailed animal caused such bemusement that the zoologist George Shaw declared it could well be a hoax. The new study, published in Nature, shows the platypus as both evolutionary relic and pioneer. Chris Ponting, at the Medical Research Council's functional genomics unit at Oxford University, said scientists had had the first chance to see if the platypus's weird appearance was reflected in its DNA: "Lo and behold, we saw genes like those in lizards and birds, as well as some like those in other mammals. It has retained many genes other mammals lost from a time when all mammals looked much like lizards." Many of the animal's stranger characteristics are now thought to have evolved independently. The venom, which is released from the male's hind leg spurs, is thought to have developed late in the animal's history. And the remarkable electrosensitive bill, which helps the platypus hunt underwater while its eyes and ears are covered, appeared long after the platypus split from its reptilian ancestors. The fact that the animal has five X and five Y chromosomes is "the weirdest thing about a very weird animal," said Ewan Birney, a co-author on the paper, based at the European Bioinformatics Institute, near Cambridge. "In theory it means there are 25 possible sexes, though in practice that doesn't happen." 请参照全文，翻译蓝色的一小段：） 答案回复可见: 回复可见内容 全篇译文请参见： http://brand.hjenglish.com/581/content/8004/ 文章来源:英国总领事馆文化教育处 我的博客"夏菡" 11楼

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