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
18
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] The studies on twins’ general intelligence show that______.
选项
A、nothing but genes can determine "g"
B、genes play an important role in "g"
C、the correlation between identical twins is 1
D、identical twins are more intelligent
答案
B
解析
第四段讲,研究表明identical twins的智力相关度是0.85,而non-identicaltwins是0.6。最后一句的含义是,这表明基因在智力中发挥很重要的作用,但不是决定智力的唯一因素。
转载请注明原文地址:https://tihaiku.com/zcyy/4014373.html
相关试题推荐
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
"Intelligence"atbestisanassumptiveconstructthemeaningofthewordhasne
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
Theterm"g"(generalintelligence)representsameasureofoverallcognitive
随机试题
Mycar’sgearleverdoesmorethandispensetransmissionrations.Itpanders
Recurrenteducationisinstructionformenandwomenwhonolongergotosch
我们所知的事实是,战争并非像很多人相信的那样完全是“人性”的产物。如果正如许多人所信的那样,战争和人与人之间的暴力会在整个人类历史上并且在所有或者几乎所
Veryfewpeoplecanget【D1】______before11,butMichaelwasan【D2】______.He
居住区中心公共绿地中的绿化面积为:()A.(不含水面)不宜小于该绿地的50%
关于使用中的消毒剂、灭菌剂的监测,下列哪项是错误的()A.应进行生物和化学
个性倾向性主要包括()。A.感觉、知觉、记忆、想象和思维 B.性格、气质
一个不计厚度的圆柱型无盖透明塑料桶,桶高2.5分米,底面周长为24分米,AB为底
下列做法可能导致商业银行面临较高流动性风险的有()。A.将大量短期借款用于长期
A.1.5m/s B.2m/s C.2.5m/s D.3m/s
最新回复
(
0
)