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
A、How animals react to frightening situations. B、Why mice are particularly fearful animals. C、Whether fearfulness is a genetic t
A、How animals react to frightening situations. B、Why mice are particularly fearful animals. C、Whether fearfulness is a genetic t
admin
2009-04-23
41
问题
We’ve been looking at fear from a biological perspective, and someone asked whether the tendency to be fearful is genetic. Well, some studies done with mice indicate that mammals do inherit fearfulness to some degree. In one study, for instance, a group of mice was placed in a brightly-lit open box with no hiding places. Some of the mice wandered around the box and didn’t appear to be bothered of being so exposed. But other mice didn’t move. They stayed up against one wall, which indicated that they were afraid. Well, when fearful mice, or you might say anxious mice like the ones who stayed in one place. When mice like these were bred with one another repeatedly, after about 12 or so generations, then all of the offspring showed similar signs of fearfulness. And even when a new-born mouse from this generation was raised by a mother and with other mice who were not fearful, that mouse still tended to be fearful as an adult. Now why is this? Well it’s thought that specific genes in an animal’s body have an influence on anxious behavior. These are genes that are associated with particular nerve-cell receptors in the brain. And the degree of overall of fearfulness in the mammal seems to depend in large part on the presence or absence of these nerve-cell receptors. And this appears to apply to humans as well by the way. But while a tendency towards anxiety and fear may well be an inherited trait, the specific form that the fear takes has more to do with the individual’s environment. So a particular fear, like the fear of snakes or the fear of spiders, say, is not genetic, but the overall tendency to have fearful responses is.
选项
A、How animals react to frightening situations.
B、Why mice are particularly fearful animals.
C、Whether fearfulness is a genetic trait.
D、Why certain animals are feared by humans.
答案
C
解析
What is the talk mainly about?
转载请注明原文地址:https://kaotiyun.com/show/aOZK777K
0
大学英语六级
相关试题推荐
Today’syoungpeoplegenerallyhavemorepurchasingpowerthantheirparents,andtheyaremorepreparedtouseit.
Havingworkedasapsychologistwithallkindsofpeople,I’velearnedthatsuccessfulpeoplearen’tnecessarilytheoneswithth
Shouldapartyrequestcancellationofthecontractwithoutavalidreason,itshallpayforalltheeconomiclossesthattheoth
Teamworkplaysanimportantpartinourdailylifeandwork,butsometimesproblemswillarisewhenweareteamingup.Istillr
Wehavefoundthatthere’snotmuch(different)______betweenthetwoproducts.
Huntingforajobcanbestressful,butthere’snoreasontohurtyourchancesbymaking【T1】______:Whenyou’reapplyingforaj
Inthemeetingheldlastnightthevicepresidentrefusedtomakeanycommentonthematterbeforemakingdueinvestigation.
Thoseworld-famousoilpaintings(exhibit)______attheMuseumofNewYorknowarepartoftheircollection.
ItwasnotuntilIwenttocollege______Ibecameinterestedincomputerprogramming.
Doyouhavenosykids,curiouscoworkers,orasnoopyspousewhoisalwayscheckingoutyourphone’sscreenwhenyouleaveitun
随机试题
男,3岁,诊断脓胸,住院第2天发生呼吸困难,发憋,烦躁,心率快,右下肺叩浊,右上肺叩鼓音。可能发生
物质资料的生产方式是人类社会存在和发展的基础和决定力量,其表现有
我国法的主要渊源是()
A.郄门B.地机C.阳交D.跗阳E.养老
某项经济业务的会计分录为:借:原材料36000贷:银行存款28800应付账款7200该分录表示的经济业务是()。
证券研究报告可以采用()形式。Ⅰ.广告Ⅱ.书面Ⅲ.电子文件Ⅳ.电视媒体
营销管理的实质就是()。[2007年真题]
下列食用油中胆固醇含量最高的是()。
新王国时期埃及宗教改革的主持者是()。
X.25公用数据网采用的交换技术是(1),ATM通信网采用的交换技术是(2)。(1)
最新回复
(
0
)