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
Researchers studying how genes control animal behavior have had to deal with many uncertainties. In the first place, most behavi
Researchers studying how genes control animal behavior have had to deal with many uncertainties. In the first place, most behavi
admin
2019-11-17
67
问题
Researchers studying how genes control animal behavior have had to deal with many uncertainties. In the first place, most behaviors are governed by more than one gene, and until recently geneticists had no method for identifying the multiple genes involved. In addition, even when a single gene is found to control a behavior, researchers in different fields do not necessarily agree that it is a "behavioral gene." Neuroscientists, whose interest in genetic research is to understand the nervous system (which generates behavior), define the term broadly. But ethologists—specialists in animal behavior—are interested in evolution, so they define the term narrowly. They insist that mutations in a behavioral gene must alter a specific normal behavior and not merely make the organism ill, so that the genetically induced behavioral change will provide variation that natural selection can act upon, possibly leading to the evolution of a new species. For example, in the fruit fly, researchers have identified the gene Shaker, mutations in which cause flies to shake violently under anesthesia. Since shaking is not healthy, ethologists do not consider Shaker a behavioral gene. In contrast, ethologists do consider the gene period (per), which controls the fruit fly’s circadian (24-hour) rhythm, a behavioral gene because flies with mutated per genes are healthy; they simply have different rhythms.
The passage suggests that neuroscientists would most likely consider Shaker to be which of the following ?
选项
A、An example of a behavioral gene
B、One of multiple genes that control a single behavior
C、A gene that, when mutated, causes an alteration in a specific normal behavior without making the organism ill
D、A gene of interest to ethologists but of no interest to neuroscientists
E、A poor source of information about the nenous system
答案
A
解析
Application
The passage asserts that ethologists do not regard Shaker as a behavioral gene because it merely makes fruit flies exhibit unhealthy behavior (shaking under anesthesia). But neuroscientists, according to the passage, are mainly interested in how genes, via the nervous system, contribute to behavior. The passage suggests that neuroscientists, unlike ethologists, have no reservation about using the term behavioral gene to apply to any gene that contributes to behavior. The implication is that neuroscientists would probably regard Shaker as a behavioral gene.
A Correct. The passage suggests that neuroscientists would probably regard Shaker as a behavioral gene.
B The passage indicates that research shows Shaker is a sufficient cause, in fruit flies, of shaking under anesthesia. Although some organism might display a behavior controlled by Shaker in concert with other genes, the passage is silent on any such possibility.
C The passage lacks information as to whether there is any alteration—one that neuroscientists would likely consider healthy—in a normal behavior if the alteration is caused by a mutation in Shaker.
D The passage indicates that neuroscientists’ interest in genetics is part of their effort to understand the nervous system. This seems to imply that neuroscientists might be interested in Shaker.
E The passage is silent on how neuroscientists would evaluate the potential for Shaker to contribute to understanding of the nervous system.
The correct answer is A.
转载请注明原文地址:https://kaotiyun.com/show/rQkO777K
本试题收录于:
GMAT VERBAL题库GMAT分类
0
GMAT VERBAL
GMAT
相关试题推荐
WeallknowthatDNAhastheabilitytoidentifyindividualsbut,becauseitisinherited,therearealsoregionsoftheDNAstr
Wasitbecausehewasill________heaskedforleave?
Byeducation,Imeantheinfluenceoftheenvironmentupontheindividualtoproduceapermanentchangeinthehabitsofbehavio
Byeducation,Imeantheinfluenceoftheenvironmentupontheindividualtoproduceapermanentchangeinthehabitsofbehavio
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavoritedrinksaregoodforus.Oneday,sciencesaysagla
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavoritedrinksaregoodforus.Oneday,sciencesaysagla
Nooneknowshowmanlearnedtomakewords.Perhapshebeganbymakingsoundslikethosemadebyanimals.Perhapshegruntedlik
Generallyspeaking,employersarelookingfortwothingsinjobapplicants:proofthatacandidatecanhandleaspecificjoband
随机试题
Tobeagoodteacher,youneedsomeofthegiftsofagoodactor;youmustbeableto【C1】______theattentionandinterestofyou
门静脉高压,急性上消化道出血的紧急处理如该病人需行分流术,分流指征
消化道传染病的传播途径是通过
1岁小儿,发热、咳嗽4天,气促1天,精神差,躯干部见充血性粟粒状丘疹,右肺叩诊浊音,呼吸音低,右上肺可闻细湿啰音,气管左移,WBC28×109/L,中性88%。最可能的诊断为
背景某架空光缆线路工程位于南方某市郊,工程初步设计已经批复,建设单位根据初步设计与材料供货商签订了供货合同,并经过招标选定了施工单位和监理单位。在与施工单位进行合同谈判时,建设单位认为施工单位在此工程施工过程中不会有贷款的问题,双方协商取消了费用
自1984年1月1日起,中国人民银行开始专门行使中央银行的职能,所承担的工商信贷和储蓄业务职能转交至()。
导游词的创作要以人为本,应注意的方法与技巧有()。
在人的发展阶段,被称为“危险期”或者“心理断乳期”的时期是()
用于告知不需直接执行或办理的事项,主要起交流情况、传递信息的作用,一般无执行效用,既可发给下级机关,也可发给平行机关的是()。
2014年全国国内游客36.1亿人次,同比增长10.7%,国内旅游收入30312亿元,同比增长15.4%。人境游客12849万人次,同比下降0.5%。在入境游客中,过夜游客5562万人次,与上年基本持平。国际旅游外汇收入569亿美元,同比增长10.2%。
最新回复
(
0
)