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主题: 「物种」不可貌相
「物种」不可貌相
11 年 1 个月 前
#84
mike lee
离线
Intermediate English-2 /Animals /Looks Aren’t Everything
「物种」不可貌相
07-24
四条短腿快速移动时,脸扁扁的小哈巴狗让人想到填充玩具。而哈士奇犬外貌似狼,动作宛如老练的野地猎食者。奇怪的是,这两种外貌迥异的动物属于同一物种Canis familiaris,也就是大家熟悉的狗。动物的外貌差异,让科学家重新思索如何区分物种。
既然无法总是依动物的外貌来区别物种,科学家已开始使用DNA来协助辨识。「生命条形码计划」专门研究每一物种具有独特序列的单一基因。科学家将这个基因当作条形码,用来将相似的动物归类为同一群。基因序列相同的动物就是来自同一物种。
这种方法不仅有助于辨识目前的物种,也能帮我们了解物种的演化。比如说,透过DNA研究,科学家已经发现,家犬是从很久以前被驯化的野生灰狼演化而来。「生命条形码计划」确实有助于科学家进一步了解动物王国。
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