课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福听力 > 正文
托福培训

扫码免费领资料

内含托福全科备考资料

更有免费水平测试及备考规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福听力练习-科学美国人60秒:变种香蕉基因组

2017-04-05 10:14:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：变种香蕉基因组

　　科学美国人60秒听力练习：变种香蕉基因组

　　科学美国人60秒英文文本

　　It's not easy being yellow: bananas now face two separate fungal epidemics, which threaten to pluck the fruit off of our tables. Fortunately, researchers have now sequenced banana DNA, producing the genome of a banana variety that may hold the secret to defeating the diseases. The report is in the journal Nature.

　　Today, half of all bananas, including the ones you probably buy, belong to the Cavendish variety, whose popularity stems in part from having no seeds. But this trait also removes sexual reproduction from the equation. The bananas are thus all genetically identical—and identically vulnerable to the two fungal epidemics, Panama disease and black leaf streak disease.

　　Researchers sequenced the genome of a banana variety called DH-Pahang, whose genes contributed to the Cavendish. While the genome shows where this fruit fits in the history of plant evolution, it could also help researchers understand why DH-Pahang, unlike its descendant, is resistant to the funguses behind both Panama and black leaf streak disease.

　　Knowing the genes responsible for this resistance could help breeders create stronger, more resistant bananas. Which has a lot of appeal.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10