英語(yǔ)聽力 學(xué)英語(yǔ),練聽力,上聽力課堂! 注冊(cè) 登錄
> 在線聽力 > 有聲讀物 > 英語(yǔ)雜志 > 英語(yǔ)聽力文摘 >  第294篇

英語(yǔ)聽力文摘 形態(tài)各異的狗

所屬教程:英語(yǔ)聽力文摘

瀏覽:

手機(jī)版
掃描二維碼方便學(xué)習(xí)和分享
https://online2.tingclass.net/lesson/shi0529/0007/7643/278.mp3
https://image.tingclass.net/statics/js/2012
Man’s Best Friend—in All Shapes and Sizes

Scientists are making great strides in understanding the genes that allow such a wide range of shapes, sizes and personalities in different dog breeds.

Did you know domestic dogs were bred from wolves about 15,000 years ago? That's pretty recent in evolutionary terms, isn't it? Very. Humans have sped up the diversification of dogs by selecting for particular physical or behavioral traits such as size, coat type, trainability, and hunting or herding ability. But dogs still show greater variety than any other domesticated animal, and for a long time this variance has largely been unexplained.

A group of genetics researchers collaborated with dog breeders and veterinarians to study the DNA from 148 different dog breeds. With such a large sample of genes from very different kinds of dogs, they were able to identify regions in the dog DNA that are important in regulating some key traits that differ between breeds.

Four regions were found that may regulate life span, a breed characteristic that usually decreases with increasing body size. Regions associated with some behavioural stereotypes like herding, pointing and boldness were also identified.

The study could have far-reaching benefits for dogs and their owners. With further research, dog owners and vets could use this information to customize the care, diet and medicines to the particular needs of their breed, and to identify and perhaps prevent breed-specific diseases.

用戶搜索

瘋狂英語(yǔ) 英語(yǔ)語(yǔ)法 新概念英語(yǔ) 走遍美國(guó) 四級(jí)聽力 英語(yǔ)音標(biāo) 英語(yǔ)入門 發(fā)音 美語(yǔ) 四級(jí) 新東方 七年級(jí) 賴世雄 zero是什么意思清遠(yuǎn)市東方明珠陽(yáng)光橙(東城大道68號(hào))英語(yǔ)學(xué)習(xí)交流群

網(wǎng)站推薦

英語(yǔ)翻譯英語(yǔ)應(yīng)急口語(yǔ)8000句聽歌學(xué)英語(yǔ)英語(yǔ)學(xué)習(xí)方法

  • 頻道推薦
  • |
  • 全站推薦
  • 推薦下載
  • 網(wǎng)站推薦