首页
登录
职称英语
The term "g"(general intelligence)represents a measure of overall cognitive
The term "g"(general intelligence)represents a measure of overall cognitive
游客
2025-03-27
5
管理
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. [br] All of the following statements about "g" are true EXCEPT______.
选项
A、g is to some extent inherited
B、g correlates with IQ
C、g can be attributed to a single gene
D、g is a measure of cognitive ability
答案
C
解析
文章第一段中有it tends to correlate,还有general intelligence tends to runin families和represents a measure of overall cognitive ability,从而说明选项A,B,D符合题意。第二段第一句的含义是:还没有确凿的证据表明某一种基因与智力相关,因此否定了选项C的合理性。
转载请注明原文地址:https://tihaiku.com/zcyy/4014371.html
相关试题推荐
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
HealthhascometobeoneoftheutmostconcernsamongthegeneralpublicinChi
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
Itisgenerallyrecognizedthatdifferentformsofmusiccanconveydifferentki
随机试题
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Biogas:aSolutiontoManyProblemsInalmostalldevelo
Theconceptofstudentexchangebetweencountriesisnotanewone.Itisco
2级高血压(中度)A.<120mmhg和<80mmhg B.120~139
下列各项,不属于风热犯肺证临床表现的是()A.咳嗽 B.鼻塞流浊涕 C
紫外分光光度法常用的波长范围是()A.760~400nm B.200~
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
2004-127.醋制能降低毒性的药物是 A.商陆B.芫花C.大戟D.甘
一般而言,现实市场中的套利交易面临的风险有()。A:资金风险B:操作风险C:
目视助航灯光安装工程质量的评定标准包括( )工程质量评定标准等。A.飞机机位引导
最新回复
(
0
)