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
67
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)
Difference in the size of the two hemispheres exists in a monkey’s brain.
选项
A、Y
B、N
C、NG
答案
B
解析
见第四段最后一句“Since monkeys have not acquired the capacity for speech, one would not expect to see such a difference but Brinkman claims to have discovered a trend in monkeys towards the asymmetry that is clearly observed in the human brain.”
转载请注明原文地址:https://kaotiyun.com/show/G6V7777K
0
大学英语四级
相关试题推荐
A、Interviewerandapplicant.B、Teacherandstudent.C、Colleagues.D、Salespersonandcustomer.A
A、Tomakeplansforthedevelopmentofpoorcommunities.B、Toteachpeoplehowtousenewskillstoraiseanimals.C、Tohelpsta
Socialchangeismorelikelytooccurinsocietieswherethereisamixtureofdifferentkindsofpeoplethaninsocietieswhere
Educationistooimportanttotake【B1】______.Whenpeopletakeanythingtooseriously,theyputonblinders,whichcausethemto
A、Thepersonnelmanagershouldbefiredforinefficiency.B、Afewengineersshouldbeemployedtomodernizethefactory.C、Thee
A、Awriter.B、Alawyer.C、Areporter.D、Ateacher.C
______(我们一得出这个结论)thantheyagreedtoit.
Theresultswere____________(无可争议的)becausetheyhadbeenrepeatedinlaboratoriesallovertheworld.
A、About26caseshavebeenconfirmedtocontractH5IN1intheTropicalDiseaseInstitute.B、Vietnamhasdetected65humancases
A、$36.B、$40.C、$100.D、$150.00D本题是一道数学计算题。男士打算订一大一小两个房间,而大房间的价格是每晚30美元,小房间每晚20美元,本题提问他们住三天需要的费用,通过算式(30+20)*3就可以得出总费用为150美元,所以
随机试题
重度营养不良患儿,护士应重点观察
治疗急性心肌梗死引起的室性心律失常的最佳药物是
患者,男性,9岁,舌体外伤出现部分组织缺损,处理原则是
背景资料某高速公路项目,路面面层为沥青混凝土,基层为级配碎石,项目经理部决心精心组织、科学施工,搞好现场技术质量管理,做了包括如下环节的工作:——项目经理部由总工程师组织进行了技术交底;——为真正落实公司的现场技术管理制度制定了执行细则,其中,为避免
采用个案管理的方法进行矫正社会工作时应注意的问题有()。
当代中国,坚持“发展是硬道理”的本质要求是()。
在多媒体信号传输过程中,如果图像与语音没有同步,人物说话的口型与声音就不会吻合,观众会感觉很不舒服。这种音频流与视频流之间的相关叫做【 】。
下列关于SQL对表的定义的说法中,不正确的选项是()。
Humanintelligencetechnologyhasbeenthrivingoverthepastdecade.Now,wehavesuper-computersthatevenbeathumansingo.
Itisonlyrightthatthestarsshouldbepaidinthisway.Don’tthetopmeninindustryearn【B1】______salariesfortheservice
最新回复
(
0
)