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
2024-02-28
28
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] 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://tihaiku.com/zcyy/3489676.html
相关试题推荐
"Humansshouldnottotrytoavoidstressanymorethantheywouldshunfood
Peoplefindthatlikehumanschimpanzees(黑猩猩)use"tools":theystriptwigs
Peoplefindthatlikehumanschimpanzees(黑猩猩)use"tools":theystriptwigs
Peoplefindthatlikehumanschimpanzees(黑猩猩)use"tools":theystriptwigs
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscover
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscover
RightandLeft-handednessinHumansWhydohumans,quite
RightandLeft-handednessinHumansWhydohumans,quite
RightandLeft-handednessinHumansWhydohumans,quite
RightandLeft-handednessinHumansWhydohumans,quite
随机试题
【B1】[br]【B8】A、keepB、retainC、maintainD、reserveC语义衔接题。该句中的and表示所填词和repair并列作
WhatIsAnAmerican?"Ican’tmakeyouout,"HerryJameshas
HowtodevelopthewillpowerJustassomeoneputsit,w
下列有关钙通道阻滞药的叙述哪项错误()A.普萘洛尔降低钙通道阻滞药的清除
A.表面麻醉下清醒气管插管 B.表面麻醉下清醒支气管插管 C.快速诱导气管插
股权投资基金A以投前估值9亿元向公司B增资1亿元,投后持有B的10%股权,股东协
A.陈皮B.乌药C.香附D.沉香E.薤白善于行气止痛、温中止呕的药物是
A.淋法 B.清水洗 C.漂法 D.泡法 E.润法川乌宜采用
关于对老年人药物吸收叙述不正确的是A.老年人胃酸分泌减少,酸性药物离子型吸收减少
对于有担保流动资金贷款,下述情况可能引发信用风险的有()。 A.借款人净现金
最新回复
(
0
)