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
"Hidden" Species May Be Surprisingly Common Cryptic species animals that appear identical but are genetically quite distant—
"Hidden" Species May Be Surprisingly Common Cryptic species animals that appear identical but are genetically quite distant—
admin
2011-01-02
43
问题
"Hidden" Species May Be Surprisingly Common
Cryptic species animals that appear identical but are genetically quite distant—may be much more widespread than previously thought. The findings could have major implications in areas ranging from biodiversity estimates and wildlife management, to our understanding of infectious diseases and evolution.
Reports of cryptic species have increased dramatically over the past two decades with the advent of relatively inexpensive DNA sequencing technology. Markus Pfenninger and Klaus Schwenk, of the Goethe-Universitat, in Frankfurt, Germany, analyzed all known data on cryptic animal species and discovered that they are found in equal proportions throughout all major branches of the animal kingdom and occur in equal numbers in all biogeographieal regions.
Scientists had previously speculated that cryptic species were predominantly found in insects and reptiles, and were more likely to occur in tropical rather than temperate regions. "Species that are seemingly widespread and abundant could in reality be many different cryptic species that have low populations and are highly endangered. " Says Pfenninger. Until the genetic information of all species in at least one taxon is thoroughly studied, no one will know just how many cryptic species exist. "It could be as high as 30%. " Pfenninger says.
"I’m extremely surprised by their results. " Says Alex Smith of the University of Guelph in Ontario, Canada. "It’s a call to arms to keep doing the broad kind of genetic studies that we are doing. "
Sampling as many individuals as possible, scientists hope to complete work on all fish and birds in another 5 to 10 years. Once either of these taxonomic groups is completed, Pfenninger says researchers will be able to decide how many cryptic species exist throughout the animal kingdom.
Examples of cryptic species include the African elephant. A 2001 study found the elephants were actually two genetically distinct, non-interbreeding species, the African bush elephant and the African elephant. The species are currently listed as vulnerable and threatened, respectively, by the World Conservation Union (WCU).
The reclassifications are more than an academic exercise. They define populations that have evolved independently of each other and whose genetic differences can have significant consequences. In the early 1900s misidentification of mosquito species based on morphology confused attempts to control malaria in Europe. Ultimately, what was thought to be a single species was actually made up of six sibling species, only three of which transmitted the disease. "The basic unit in biology is always the species, and you have to know what you are dealing with. " Pfenninger says. Much previous research is now no longer used, he says, because it is not clear what species was being studied.
Which of the following about the significance of the research on cryptic species is NOT true?
选项
A、The results of the research can help the development of many other research areas.
B、The results of the research can help the development of biodiversity estimates.
C、The results of the research can help our understanding of infectious disease evolution.
D、The results of the research can help our understanding of "survival of the fittest. "
答案
D
解析
短文第一段第二句的大意是,研究结果为广泛的研究领域提供启示。包括生物多样性研究,还能帮助我们理解传染疾病及其演变。所以选项A、B、C都是正确的。它们不是答案。选项D的“适者生存”的内容文章中没有提及,因此D是本题的答案。
转载请注明原文地址:https://kaotiyun.com/show/PyLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
OntheTrialoftheHoneyBadgerOnarecentfieldtriptotheKalahariDesert,ateamofresearcherslearnalotmoreabout
EarBreakthroughNewresearchpublishedinthejournalCurrentBiologyhasaddedsignificantlytounderstandingofhowthee
ManyChildren’sDeathsPreventable:WHOOverfivemillionchildrendieeachyearfromdisease,infectionsandaccidentsrela
LivingAloneCouldBeGoodforYourWeightGoodnewsforpeoplelivingalone:Aforthcomingpapershowsthatsingleadults—o
LivingAloneCouldBeGoodforYourWeightGoodnewsforpeoplelivingalone:Aforthcomingpapershowsthatsingleadults—o
MobilePhonesMobilephonesshouldcarryalabeliftheyprovedtobeadangeroussourceofradiation,accordingtoRobertBell,
Thesearetheirmotivesfordoingit.
IrradiatingFoodIrradiatingfruits,vegetables,porkandchickentokillinsectsandbacteriahasbeenapprovedbytheFood
TheFoodScandalWidensAsthescopeofthefoodscandalwidensinTaiwan—morethan200firmsand500productshavebeeninv
Heisdeterminedtoconsolidatehispower.
随机试题
骨牵引术,下列哪项护理措施能防止过度牵引
根据共有建筑面积的使用功能,共有建筑面积主要的可分为()类。
依据施工合同示范文本的规定,下列有关设计变更说法中正确的有( )。
根据奥肯定律,实际经济增长率每高于潜在经济增长率1个百分点,则失业率会()。
2015年5月20日甲公司从证券市场购入A公司股票60000股,划分为交易性金融资产,每股买价8元(其中包含已宣告但尚未发放的现金股利0.5元),另支付相关交易费用5000元。2015年12月31日,甲公司持有该股票的市价总额为510000元。2016年2
学科《课程标准》的主要内容是()。
十七大以来,党对兴起社会主义文化建设新高潮,推动社会主义文化大发展大繁荣作出战略部署。这是基于()。
井冈山被誉为“中国革命的摇篮”和“新中国的奠基石”,这主要是因为井冈山()。
简述赫尔巴特的主要教育思想。
A—NewYear’sDayB—Valentine’sDayC—LanternFestivalD—CarnivalE—AprilFool’sDayF—EasterG—MapleSyrupFestiva
最新回复
(
0
)