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
The term "g"(general intelligence)represents a measure of overall cognitive ability across a variety of tests. It’s not the same
The term "g"(general intelligence)represents a measure of overall cognitive ability across a variety of tests. It’s not the same
admin
2013-09-04
147
问题
The term "g"(general intelligence)represents a measure of overall cognitive ability across a variety of tests. It’s not the same as IQ but it does tend to correlate. Everyone agrees that "g" tends to run in families. But is this down to genetics or to environmental influences?
However, no single gene has yet been conclusively linked to intelligence. Rather it appears to be a case of complex interactions on many levels between many different genes.
Identical twins have exactly the same genes, while non-identical twins share about half their genes. Another feature of twins that makes them an ideal choice for studies is that they tend to be raised in pretty much the same environment. If a particular feature is the same in identical twins, but not in non-identical twins, then chances are it’s mainly genes that are controlling that feature.
So what do the twin studies show? Well, first degree relatives tend to have "g" correlation of about 0.4—0.5.(Perfect correlation is 1; correlation of 0 means that the two things in question are totally unrelated). Identical twins have a correlation of 0.85, while for non-identical twins it’s about 0.6. Which suggests that genes play a very important role, but are not the only factor, since if they were, the correlation between identical twins would be 1.
Identical twins reared apart are almost as similar in "g" scores as those reared together. Adopted children and their adoptive parents have a "g" correlation of zero, while adopted children and their biological parents tend to have the same correlations as any parent-child pair. So although genes don’t seem to be the only thing affecting intelligence, their effects seem to be constant and apparently not overridden by environment.
Does heritability of intelligence alter over a lifetime? Remarkably, it appears so. "g" heritability climbs gradually from 20% in babies to 40% in children, peaking at 60% in adults. Why this should be is still a matter of speculation. It’s been suggested that as our cognitive abilities become more complex, new genes may come into play that were not needed when brain functions were less sophisticated. Or individuals may be drawn towards environments that fit with their genetic makeup, as time goes by and genetic effects that started out small in childhood build up together during adulthood.
It can be concluded from the passage that______.
选项
A、it is easy to identify what determines our intelligence
B、genes are a more important determinant of "g" than environment
C、identical twins have exactly the same IQ
D、IQ depends more on environment than on genes
答案
B
解析
第五段最后一句说,虽然基因不是决定智力的唯一因素,但这种影响是终身的,而且影响的程度显然超过环境的影响。
转载请注明原文地址:https://kaotiyun.com/show/y2HO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Sherememberedseveraloccasionsinthepast______shehadexperiencedasimilarfeeling.
Histeacherdeemedhisabsencefromclass______;shehadobservedhimplayingvigorouslywithhisfriendsthroughouttheday,wi
Byalmosteverymeasure,PaulPfingstisanunsentimentalprosecutor.LastweektheSanDiegoCountydistrictattorneysaidhef
Technically,anysubstanceotherthanfoodthataltersourbodilyormentalfunctioningisadrug.Manypeoplemistakenlybeliev
Thereareincreasinglyfraughtrelationshipsthatadultsarehavingwithchildren—inallwalksoflife,fromthepoliceandpoli
Ifambitionistobewellregarded,therewardsofambitionwealth,distinction,controloverone’sdestinymustbedeemedworth
Insuchachanging,complexsocietyformerlysimplesolutionstoinformationalneedsbecomecomplicated.Manyoflife’sproblems
Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.B
Asoneoftheyoungestprofessorsintheuniversity,MissKingiscertainlyonthe______ofabrilliantcareer.(北京航空航天大学2013年试题)
Thereisprobablynolimittowhatsciencecandointhewayofincreasingpositiveexcellence.【T1】Healthhasalreadybeengrea
随机试题
计算机中数据的最小单位是( )。
囊痈时,阴囊的表现哪项是错误的
少阳头痛。选用哪组“引经药”
选择性货币政策工具主要包括优惠利率、再贴现利率、消费信用控制和贷款额度控制4种。()[2006年考题]
以下关于集装箱检验检疫的描述,不正确的是( )。
优化资产负债利率期限结构包括业务发展和资本管理两方面。()
关中平原和汉中盆地都是陕西省的主要农业区,()被称为“陕西小江南”。
投资者越担心他们的钱遭受损失,他们就越要求其投资有较高的潜在收益。大的风险必须要被高回报的机会所抵消,这项原则是决定利率时的基本原则,并且它可以从以下事实得到说明,即:_________。以下哪一项能最好地完成以上短文?()
下列情形中属于民事法律事实的是( )。
在存贮管理中,(21)与存贮量大小无关,存贮模型(22)是一种缺货不补且一次进货的模型。假设某工厂甲车间每年半成品生产能力为a吨,乙车间每年对它的需要量为b吨,甲车间每次调拨半成品的手续费为c元,每吨每年存贮费为d元,乙车间停工待料损失费为e元,其中a>b
最新回复
(
0
)