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
考研
Researchers have known for years that children whose mothers were chronically stressed during pregnancy—by famine, anxiety, the
Researchers have known for years that children whose mothers were chronically stressed during pregnancy—by famine, anxiety, the
admin
2021-09-17
56
问题
Researchers have known for years that children whose mothers were chronically stressed during pregnancy—by famine, anxiety, the death of a relative or marital discord, for instance—show higher-than-normal rates of various psychological and behavioural disorders when they are adults. They have also known for a long time that those brought up in abusive environments often turn out to be abusive themselves. The second of these observations is usually put down to learning. The reason for the first has remained unclear. A study just published by Axel Meyer, Thomas Elbert and their colleagues at the University of Konstanz in Germany, however, points to a phenomenon called epigenetics as the likely answer. Epigenetics is a type of gene regulation that can be passed from a cell to its daughters. The most common mechanism is methylation, whose consequence is to inactivate the gene being methylated.
They found that women abused during pregnancy were significantly more likely than others to have a child with methylated glucocorticoid-receptor genes. By contrast, abuse before or after pregnancy resulted in no such correlation. Nor was the mother’s own methylation affected by violence towards her. Taken together, these results suggest that glucocorticoid-receptor-gene methylation happens in the fetus in response to a mother’s stress, and persists into adolescence.
This has implications for those adolescents’ long-term health.
Dampened
glucocorticoid-receptor-gene activity has been shown to increase the risk of obesity and of depression. It also makes people more impulsive and aggressive—and therefore, if male, more likely to abuse the pregnant mothers of their children, thus perpetuating the whole sorry cycle.
Why, in light of such negative effects, have humans evolved to be programmed this way while still in the womb? Part of the answer is probably that not all the negative consequences would have shown up at the time the mechanism was evolving. The other part is that some of the consequences probably have a positive effect.
What can be done with such knowledge is unclear. Drugs that demethylate DNA are under development, but are still some way from approval—and, in any case, interfering with epigenetics, which is a widespread mechanism of gene regulation, is a drastic approach. The research might, though, point to the period when intervening to stop abuse will have the greatest effect. Then again, such intervention is always desirable, for the sake of both mother and child.
A child with methylated glucocorticoid-receptor genes has a mother_____.
选项
A、with great pressure
B、abused before pregnancy
C、abused during pregnancy
D、abused after pregnancy
答案
A
解析
细节题。根据题干关键词定位到第二段。该段末句提到“总体看来,这些结论表明胎儿糖皮质激素受体基因的甲基化是由于母亲压力过大引起的”,故A项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/Ma1Z777K
0
考研英语一
相关试题推荐
ThewordRenaissancehasoflateyearsreceivedamoreextendedsignificancethanthatwhichisimpliedinourEnglishequivalen
Finally,otherpeoplemaygiveusinstrumentalsupport—financialaid,materialresources,andneededservices—thatreducesstres
TheU.S.SecretService,whichstudies"targetedviolence",providesinsightontheurgencyoftheneedinits2002"SafeSchool
ManysignspointtoagrowinghistoricalconsciousnessamongtheAmericanpeople.Itrustthatthisisso.Itisusefultoremem
NancywasafixtureatMadridgamesinherschoolday.
Theprovisionofpositiveincentivestoworkinthenewsocietywillnotbeaneasytask.【F1】Butthemostdifficulttaskofall
Asmanypeoplehitmiddleage,theyoftenstarttonoticethattheirmemoryandmentalclarityarenotwhattheyusedtobe.We
Expressionismisanartisticstyleinwhichtheartistseekstodepictnotobjectiverealitybutratherthesubjectiveemotions
Intheory,agovernmentbailoutshouldprovideashort-terminfusionofcashtogiveastrugglingcompanythechancetorightit
Intheory,agovernmentbailoutshouldprovideashort-terminfusionofcashtogiveastrugglingcompanythechancetorightit
随机试题
被里格斯选作其棱柱社会概念的代表的国家是()
关于对比度的叙述,正确的是
A.异烟肼-吡唑酮分光光度法B.麝香草酚分光光度法C.N,N-二乙基对苯二胺分光光度法D.纳氏试剂分光光度法E.盐酸萘乙二胺分光光度法水中氰化物的测定方法为
我国目前标准轨型有()。
甲企业2015年已计入到成本、费用中的全年实发的合理工资、薪金总额为40000元,销售(营业)收入120000元,实现利润总额100000元,发生业务招待费3000元。根据企业所得税法律制度的规定,该企业在计算2015年应纳税所得额时,准予扣除的业务招待费
银行金融创新的基本原则不包括()。
用来衡量外债总量是否适度的偿债率指标的计算方法是()。
请根据图表回答问题。在2001~2004年间,企业利润呈减幅状态的厂次共多少?()
甲被恶狗追咬,为避免被咬伤,夺过从其旁边经过的乙的名贵手提包,向狗打去。狗被打伤,乙的手提包也被损坏。甲的行为构成()。
有如下程序:OptionBase1PrivateSubForm_Click()Dimarr,SumSum=0alt=Array(1,3,5,7,9,11,13,15,17,19)
最新回复
(
0
)