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
For hundreds of years, farmers have selected and bred plants and animals to favor, or bring out, characteristics they desired. F
For hundreds of years, farmers have selected and bred plants and animals to favor, or bring out, characteristics they desired. F
admin
2010-06-18
25
问题
For hundreds of years, farmers have selected and bred plants and animals to favor, or bring out, characteristics they desired. For example, cows that produced large amounts of milk were selected for breeding, while poor milk producers were not allowed to reproduce. In like manner, horses were bred for speed and strength. Those having these desired characteristics were selected for breeding. Over time, these preferred breeds became more common than earlier, less desired types. This selective breeding is called artificial selection.
In this passage, Camp and Arms explain how this same process occurs naturally. The theory of evolution by natural selection was put forward in a joint presentation of the views of Charles Darwin and Alfred Russell Wallace before the Linnaean Society of London in 1858. Darwin and Wallace were not the first to suggest that evolution occurred; but their names are linked with the idea of evolution because they proposed the theory of natural se- lection as the mechanism by which evolution occurs. We are always more likely to believe in a process when people explain how it happens than if they merely assert that it does.
The theory of evolution by means of natural selection is based on three observations. First, as we can see by comparing one cat or human being with another, the members of a species differ from one another; that is, there is variation among individuals of the same species. Second, some (though not all) of the differences between individuals are inherited. (Other differences are not inherited, but are caused by different environments. For in- stance, two plants with identical genes may grow to different sizes if one of them is planted in poor soil. ) Third, more organisms are born than live to grow up and reproduced many organisms die as embryos or seeds, as saplings, nestlings, or larvae.
Inherited characteristics that improve an organism’s chances of living and reproducing will be more common in the next generation and those that decrease its chances of reproducing will be less common. Various genes or combinations of genes will be naturally selected for or against, from one generation to the next, depending on how they affect reproductive potential. For natural selection to cause a change in a population from one generation to the next (that is, to cause evolution), it is not necessary that all genes affect survival and reproduction; the same result occurs if just some genes make an individual more likely to grow up and reproduce.
Which statement is FALSE?
选项
A、Members of a species differ from one another.
B、differences between individuals are inherited.
C、Two organisms with identical genes may grow to different sizes.
D、More organisms are born than live to reproduce.
答案
B
解析
根据第四段中“Second,some(though not all)of the differences between individuals are inherited”,就可断定[B]内容是错误的,故而是正确答案。
转载请注明原文地址:https://kaotiyun.com/show/7TlO777K
0
专业英语八级
相关试题推荐
A、US,UK,Australia,Germany,France,Canada.B、US,UK,Canada,Australia,France,Germany.C、US,UK,Germany,Canada,France,A
There’sanewcampaignfortheunder-30scalledUndivided.ItgatherssuggestionsaboutBrexitfromacrossthespectrum;leavers
Mychildrenwenttoprivateschool,andgiventhewaythingsareinoureducationsystemIamgladtheydid;but1wishIhadno
Bycomparison,farmers______receivemoregovernmentsubsidiesthanothers.Thewriter’sattitudetowardsnewfarmsubsidiesi
Whenahumaninfantisbornintoanycommunityinanypartoftheworldithastwothingsincommonwithanyinfant,providedne
InJuly1789,tenamendmentsaddedtotheAmericanconstitutionlimitingthepowersoffederalgovernmentandprotectingtherig
The3rdgenerationofprogramminglanguagesharesallthefollowingcharacteristicsEXCETPInthelate1950’s,forthefirstti
Eversinceitappearedontheculturalscene,theEnlightenmenthashaditspassionatecritics.Philosophersaswellaspolitici
______isamajorcityinthesooth-eastofNewYorkstateandcomprisesfiveboroughs,oneofwhichisManhattan,theeconomi
WhosemasterpieceTheGreatGatsbymadehimoneofthegreatestAmericannovelists?
随机试题
单位质量某物质温度升高或降低1K时,所吸收或放出的热量称这种物质的()。
水溶液加热产生沉淀的是Molish反应阳性的是
休克早期的临床表现是
张某发现自己的工资卡上多出2万元,便将其中1万元借给郭某,约定利息500元;另外1万元投入股市。张某单位查账发现此事,原因在于财务人员工作失误,遂要求张某返还。经查,张某借给郭某的1万元到期未还,投入股市的1万元已获利2000元。下列哪一选项是正确的?(2
如建筑物的高度相同,则其平面形式为()时体型系数最小,随着体型系数的增加,单位面积的传热量也相应加大。
证券公司不得利用客户的交易编码、资金账号或者期货结算账户进行期货交易。( )
阅读下列材料,完成教学设计。在标准状况下,氧气的密度是1.429g/L,比空气的密度(1.293g/L)略大。它不易溶于水,在室温下,1L中只能溶解约30mL氧气。在压强为101kPa时,氧气在-183℃时变为淡蓝色液体,在-218℃时变成淡蓝
(2009年简答26)简述酌定量刑情节的概念和种类。
请设置在“开始”菜单中显示“控制面板”项目,并且设置为“显示为菜单”。
Asgoodsandservicesimproved,peoplewerepersuadedtosendtheirmoneyonchangingfromoldtonew,andfoundthechangewort
最新回复
(
0
)