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
Right and Left-handedness in Humans Why do humans, quite different from the other animal species, display a distinct left or
Right and Left-handedness in Humans Why do humans, quite different from the other animal species, display a distinct left or
admin
2010-05-26
51
问题
Right and Left-handedness in Humans
Why do humans, quite different from the other animal species, display a distinct left or right handedness? Not even our closest relatives among the apes(猿) possess such decided lateral(横向的,侧面的) asymmetry(不对称), as psychologists call it. Yet about 90 per cent of every human population that has ever lived appears to have been right-handed. Professor Bryan Turner at Deakin University has studied the research literature on left-handedness and found that handedness goes with sidedness. So nine out of ten people are right-handed and eight are right-footed. He noted that this distinctive asymmetry in the human population is itself systematic. "Humans are able to think about things in categories: black and white, up and down, left and right, It’s a system of signs that enables us to categorize phenomena that are essentially ambiguous."
The Relationship of Handedness to Gene and Inheritance
Research has shown that there is genetic or inherited(遗传的) element to bandedness. But while left-handedness tends to appear in families, neither left nor right handers will automatically produce children with the same handedness; in fact about 6 per cent of children with two right-handed parents will be left-handed. However, among two left-handed parents, perhaps 40 per cent of the children will also be left-handed. With one right and one left-handed parent, 15 to 20 per cent of the children will be left-handed. Even among identical twins who have exactly the same genes, one in six pairs will differ in their handedness.
Researchers Turned to the Brain for Reasons
while anything on the left is dangerous or even evil. We speak of left-handed advantages, and on the other hand according to Moore, "it is certain that left-handers often develop a stammer(口吃) as they are robbed of their freedom of speech." However, as more research is undertaken on the causes of left handedness, attitudes towards left-handed people are gradually changing for the better. Indeed when the champion tennis player Ivan Lend was asked what the only factor had improved his game, he said he would like to become a left-hander.
Geoff Maslen (Adapted)
With two left-handed parents, about ______ per cent of children will be right-handed.
选项
答案
60
解析
从“However, among two left-handed parents, perhaps 40 per cent of the children will also be left handed.”可以看出双亲都是左手习惯者,那么子女出现左手习惯的机率是40%,则出现左手习惯者子女的几率是60%。
转载请注明原文地址:https://kaotiyun.com/show/m6V7777K
0
大学英语四级
相关试题推荐
Oneofthethreemajorcommercialnetworks,CBSwere【M1】______organizedin1928whenitsfounderWilliamPaleya
Dogsaresocialanimalsandwithoutpropertraining,theywillbehaveaswildanimals.Theywillsoilyourhouses,【M1】_
Educationistooimportanttotake【B1】______.Whenpeopletakeanythingtooseriously,theyputonblinders,whichcausethemto
A、Itcostmuchmorethanitsworth.B、Itshouldbebroughtuptodate.C、Itcallsforimmediaterepairs.D、Itcanstillbeusedfo
Thereareagreatmanyreasonsforstudyingwhatphilosophershavesaidinthepast.Oneisthatwecannotseparatethehistory
I’vecomefromProf.LIwith______(他让我告诉你他今天不能来看你了).
Onlywhenyoucantreatgrammarasajigsaw,_____________(语法课程才能使你感到趣味盎然).
Thisisoneofthelaboratoriesthat______(今天建成的)inourinstitute.
Throughaseriesofexperiments,anAmericanscientisthasobtainedanunderstandingofthesocialstructureofthemostcomplex
A、Maryhaslittlemoney.B、Maryisfat.C、Marylikesnewtrousers.D、Marylooksyoung.B细节题,从…Ican’tgetthemon可得出说话的人因太胖而穿不上裤
随机试题
为什么说公共关系是“内求团结,外求发展”的艺术?
Youreallyhavetogetveryoldbeforeyourealizeyou’reold.I’minmymiddlefiftiesandIdon’tfeel【C1】______yet.However,
有关深大呼吸,错误的是
能增强苯扎溴铵杀菌效果的化学物质是
行政处罚的管辖是
协助建设单位在计划的目标内将建设工程建成投入使用,是建设工程监理()的内涵。
坝面作业中,黏性土干密度的测定一般可用体积为()的环刀测定。
如图所示是一个数独游戏,要满足每一行、每一列、每一个粗线宫内的数字均含1—9,且不重复,则E、F分别代表()。
∫0+∞x7dx=________.
Thewould-besleeperwhorefightshisdailybattlesinbed--orrehearsestomorrow’sproblems--findsithardtofallasleep.
最新回复
(
0
)