首页
登录
职称英语
Right and Left-handedness in Humans Why do humans, quite
Right and Left-handedness in Humans Why do humans, quite
游客
2023-07-27
10
管理
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) [br] The two sides of a human brain are the same before birth.
选项
A、Y
B、N
C、NG
答案
B
解析
见第五段第一句“Two American researchers, Geschwind and Galaburda, studied the brains of human and discovered that the difference between left and right asymmetry exists before birth”,人的左右大脑在出生前就已经有差别了。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2873413.html
相关试题推荐
"Humansshouldnottotrytoavoidstressanymorethantheywouldshunfood
"Humansshouldnottotrytoavoidstressanymorethantheywouldshunfood
"Humansshouldnottotrytoavoidstressanymorethantheywouldshunfood
Peoplefindthatlikehumanschimpanzees(黑猩猩)use"tools":theystriptwigs
Peoplefindthatlikehumanschimpanzees(黑猩猩)use"tools":theystriptwigs
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscover
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscover
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscover
RightandLeft-handednessinHumansWhydohumans,quite
RightandLeft-handednessinHumansWhydohumans,quite
随机试题
[originaltext]Twitterhaschangeditspolicyandistakingstepstoidentif
Directions:Forthispart,youareallowed30minutestowriteacompositionon
Hometheatersystemsarerevolutionizingthemoviescenebyhelpingcons
A.谷建芬 B.谭盾 C.朱践耳 D.叶小纲
2021年4月,全国妇联决定,授予中国航天科技集团有限公司杨慧等10人以及中国科
进口机器设备消费税的计税基数是( )。A.FOB+关税 B.FOB+关税+增值
按照中医理论,开窍于舌的脏腑是()。A.肺 B.心 C.脾 D.肾 E.
下列关于房地产抵押的一般规定,表述正确的是()。A.学校用于教育的教学楼等设施
空腹24~48小时后,血糖浓度的维持主要依靠 A.肝糖原分解B.肌糖原分解
以下选项中,属于税法的适用原则的有()。A.程序优于实体原则 B.法律优位原则
最新回复
(
0
)