原文已被隐藏,你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
该句暂无译文!
2 .Wheat helped create civilization in the Middle East.
该句暂无译文!
3 .It's a staple crop for 30 percent of the world's population.
该句暂无译文!
4 .And now, with the publication of four articles in the journal Science, we're close to a detailed understanding of the bread wheat genome.
该句暂无译文!
5 .Wheat is tough to sequence.
该句暂无译文!
6 .It's gone through multiple hybridizations, making its genome five times larger than a human one.
该句暂无译文!
7 .Plus there are many redundancies: more than 80 percent of the genome is made of repeated DNA sequences.
该句暂无译文!
8 .So the typical whole-genome shotgun approach breaking genomes into segments and then reassembling them doesnt work for wheat.
该句暂无译文!
9 .Instead, an international consortium devised another strategy, involving physically mapping individual chromosomes and chromosome arms.
该句暂无译文!
10 .One paper details a draft of the entire genome of bread wheat.
该句暂无译文!
11 .Another identifies all the genes on the largest of the plant's 21 chromosomes.
该句暂无译文!
12 .Some 75,000 genes have been mapped.
该句暂无译文!
13 .The methods in the second paper will help scientists map the remaining chromosomes.
该句暂无译文!
14 .They say it should take another three years.
该句暂无译文!
15 .Knowing exactly which genes are responsible for talents such as tolerating drought or improving yields should allow researchers to mine the genome and to quickly produce new and better wheat varieties to bring us our daily bread.
该句暂无译文!
16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
该句暂无译文!