首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Scientists have discovered strands of genetic code linked to short sight, the most common eye disorder in the world. The finding
Scientists have discovered strands of genetic code linked to short sight, the most common eye disorder in the world. The finding
admin
2012-08-05
51
问题
Scientists have discovered strands of genetic code linked to short sight, the most common eye disorder in the world. The findings shed light on what goes awry (出错的) to make distant objects look blurred, and raises the prospect of developing drugs to prevent the condition. Understanding the biological glitches (故障) behind short-sightedness could help researchers develop eye drops or tablets that could be given to children to stop their vision from failing as they get older.
Short-sightedness usually starts to manifest early on in life. The extent to which genes are to blame varies, but for those with the worst vision, around 80% of the condition is caused by genetic factors.
Two separate studies, published in Nature Genetics journal, found variations in DNA that were more common in people with short sight. Chris Hammond, at King’s College, London, found one section of DNA on chromosome 15 was more common in people with short sight. Caroline Klaver, at Erasmus Medical Centre in Rotterdam, found another strand, also on chromosome 15, linked to short sight.
The variations in DNA amount to misspellings in the genetic code. These alter the activity of three genes that control the growth of the eyeball and ensure light entering the eye is converted into electrical pulses in the retina (视网膜). The discovery helps scientists piece together how a healthy eye becomes short-sighted and points the way to medicines to prevent it in children.
"My hope is that we can identify a pathway that we can block with eyedrops or tablets that will stop the eye growing too much and without interfering with normal brain development or other processes in the body," Hammond told the Guardian.
Treating short sight in adults is a much tougher job, as their eyeballs have already grown too long.
Children who inherit genes for short sight are not destined to have poor vision. In 2008, Kathryn Rose at the University of Sydney looked at rates of short-sightedness in Chinese schoolchildren living in Singapore and Sydney. Some 29% living in Singapore had short sight, compared with only 3% in Sydney. One possible explanation is that those living in Sydney spent more time outdoors, and so got more natural sunlight and were used to focusing on more distant objects.
Some eye conditions are already being treated by replacing the faulty genes that cause them, but Hammond and Klaver said that too many genes contribute to short sight to make it a realistic option.
Though parents are short-sighted, their children won’t necessarily have______.
选项
答案
poor vision
解析
细节辨认题。本题考查有近视遗传基因的人是否一定会视力不好。文中提到,有近视遗传的儿童并不注定就是视力不好,故得出答案。
转载请注明原文地址:https://kaotiyun.com/show/Ebb7777K
0
大学英语六级
相关试题推荐
Theincreaseinglobaltrademeansthatinternationalcompaniescannotaffordtomakecostlyadvertisingmistakesiftheywantt
I’vealwaysbeenanoptimistandIsupposethatisrootedinmybeliefthatthepowerofcreativityandintelligencecanmaketh
OnAugust18thUSNews&WorldReportreleasedits2007rankingsofAmerica’stopcolleges.Thesurveybeganin1983asanunoff
A、Tohonorwomenpioneers.B、Toencouragethestudentstopursuetheirdreams.C、TohonortheSeptember11attack.D、Tomakemor
A、Intelligencesection.B、Cargotransfersonairplanes.C、Telecommunicationhardwaremoving.D、Datacollectingtechnique.B文章最后提
A、Youcanlearnanewculture.B、Youcanstudyaccordingtoyourschedule.C、Youcangethumaninteractionofmeetingpeople.D、
A、Theydryinashorttime.B、Theyareeasytoclean.C、Theycanbeobtainedconveniently.D、Theyaremadefromthesuperioroil
I’vealwaysbeenanoptimistandIsupposethatisrootedinmybeliefthatthepowerofcreativityandintelligencecanmaketh
A、Allthestudentswouldlikeaformalball.B、Raisingmoneywillbehard.C、Thefestivalwillbegintheyearnicely.D、Theclub
随机试题
价格中的税金是指作为价格构成独立因素的________。
A.半衰期B.药一时曲线下面积C.表观分布容积D.生物利用度E.血浆半衰期能够反应药物消除快慢的程度的是
A.绞窄性肠梗阻B.单纯性肠梗阻C.麻痹性肠梗阻D.痉挛性肠梗阻E.慢性肠梗阻
按矿料级配分类,沥青玛碲脂碎石属于()。
下列登记机关有权注销房屋权属证书的包括()。
生吃鸡蛋的习惯不好,是由于()。
公安机关在侦查国家机关工作人员张某的盗窃犯罪事实时,发现张某还涉嫌受贿,则下列说法正确的是()。
资本有机构成提高的速度,一般以
在社会主义初级阶段的所有制结构中,公有制占主体地位。公有制经济的范围包括()
WritealettertoLiuXiang,expressingcongratulationsforhisnewworldrecord.Youshouldwriteabout100wordsanddonotsi
最新回复
(
0
)