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
2013-07-20
56
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/rdn7777K
0
大学英语六级
相关试题推荐
Parentsareoftenupsetwhentheirchildrenpraisethehomesoftheirfriendsandregarditasaslur(诽谤,中伤)ontheirowncooki
A、Thewomanmadeupanastonishingstory.B、Thewomanhadintendedtoleaveherhusbandwithoutaword.C、Thewomanhadbeentak
Overthepastdecade,Americancompanieshavetriedhardtofindwaystodiscourageseniormanagersfromfeatheringtheirownne
Twogroupsofscientistsdemonstratedlastweekforthefirsttimethatthebodylaunchesamassive,effectivecounter-attackon
Twogroupsofscientistsdemonstratedlastweekforthefirsttimethatthebodylaunchesamassive,effectivecounter-attackon
Having_______________________(没有钱但又不想让任何人知道),hesimplysaidhewouldgowithoutdinner.
A、Factorsthataffecttheabilitytomemorize]B、Theinfluenceofchildhoodmemoriesonadulthood.C、Aproposalforfuturepsych
What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Ortalk?Thefirsttimeyou【C1】______thunderorwatch
Thestalledeconomy,expirationofhomebuyertaxcredits,marked-downhomeprices,stubbornlyhighunemploymentandconcernsabo
Thestalledeconomy,expirationofhomebuyertaxcredits,marked-downhomeprices,stubbornlyhighunemploymentandconcernsabo
随机试题
IcanclearlyrememberthefirsttimeImetMr.Andrews,myoldheadmaster,【21】thatwasovertwentyyearsago.Duringthewar,I
A.心尖部可触及有力的抬举感B.心尖搏动弥散C.心浊音界向两侧扩大,坐位呈“烧瓶样”D.心界呈梨形风湿性心脏瓣膜病二尖瓣狭窄
直流负荷中监控、保护、位置指示等负荷系数为()。
委托监理合同示范文本中,监理人的权利包括()。
按照建设工程项目信息的分类,编码信息属于()类信息。
关于奥尔德弗提出的ERG理论的说法,正确的是()。
根据商业银行法律制度的规定,下列情形中属于接管终止的有()。
请从右边四个选项中选出一个能由左边图形折叠而成的图形。()
Anecdotalevidencehaslongheldthatcreativityinartistsandwriterscanbeassociatedwithlivinginforeignparts.Rudyard
与RIPV1相比,RIPV2的改进是__________。(2013年上半年试题)
最新回复
(
0
)