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
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the s
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the s
admin
2019-08-01
51
问题
A woman with a twin brother has fewer children. Twin brothers can leave quite an impression. The mere presence of a boy in the same womb as his sister causes her to develop bigger teeth than she otherwise would. Girls with twin brothers perform better on spatial-ability tests. They have better ball skills than most females and are more likely to be short-sighted. Now it seems that sharingthe womb also has a harmful effect on the sexual reproduction of women with a twin brother.
Virpi Lummaa of the University of Sheffield, in Britain, and her colleagues made the claim after studying detailed data from several generations of church records from many parishes in Finland. They report that women with a twin brother were 15% less likely to get married than were women with a twin sister. Those with a male twin also had a 25% lower chance of giving birth even though they lived just as long as those with a female twin. When the researchers considered only married women, those with a twin brother on average had two fewer children during their lifetimes than did women with a twin sister. And finally—to rule out any influence of sharing a house as well as a womb—Dr Lummaa checked the results were the same for women whose twin brothers died before they were three months old. The researchers reported their findings in this week’s Proceedings of the National Academy of Sciences.
As with the teeth, the supposed cause of untypical female biology is early exposure to testosterone. This hormone is made by a male fetus’s developing testes from about seven weeks after conception and is thought to diffuse, thus influencing his sister’s growth. But the exact mechanism by which a twin brother lowers his sister’s chances of reproductive success is unclear.
Dr Lummaa’s results also suggest that, if a woman wishes to maximize the chances of passing on her genes, she would do better to avoid producing pairs of twins consisting of one boy and one girl and go for a single-sex combination instead. Mothers included in the study who produced opposite-sex twins had 19% fewer grandchildren than did mothers who gave birth to same-sex twins.
Evolutionary theory thus predicts that there should be fewer pairs of girl-and-boy non-identical twins than single-sex pairs of non-identical twins. Whether that is so requires another set of figures. Finnish church records, helpful as they are, do not distinguish non-identical same-sex twins from identical ones. In the eyes of God, unlike those of natural selection, twin girls are created equal.
According to Virpi Lummaa and her colleagues, women with twin brothers _____.
选项
A、encounter more difficulties in getting married than only-child women
B、raise two more children during their lifetime than women with a twin sister
C、enjoy a much shorter longevity than women whose female twins died early
D、present a reproduction rate a quarter less than those with a female twin
答案
D
解析
推理判断题。根据Virpi Lummaa和her colleagues定位到第二段。题干考查的是龙凤胎中女性的情况。文中提到相较双凤胎中的女性,龙凤胎中的女性生育几率降低了25%,即四分之一,此外原文中的giving birth与reproduction为同义表达,故D项正确。
转载请注明原文地址:https://kaotiyun.com/show/o12Z777K
0
考研英语一
相关试题推荐
Americanpresidentsseemtoagebeforeoureyes.Butthecommonbeliefthathigh-officestressgraysourleadersfasterthan【C1】
Thedigitalattackfrome-booksandAmazon-styleonlineretailershaveputbookstoresinanexistentialdilemma.Digitalbooksa
Theshortergrowingseasonsexpectedwithclimatechangeoverthenext40yearswillendangerhundredsofmillionsofalreadypo
Brothersandsistersfight,butwhenthebickeringevolvesintophysicaloremotionalabuse,it’sbullying.Ordinaryargumentso
Climatechangecouldhitourstomachsandourwallets,cuttingintothegrowthinfoodproductionevenastheworld’spopulation
Themajortaskfacingadolescentsistocreateastableidentity.Therearesomedevelopmentaltasksthatenablethemtocreate
Thetechnologyrevolutionmaybecomingtopoorcountriesviathemobilephone,notthepersonalcomputer,asitdidinrichone
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
YouhaveinterestinavolunteeropportunityattheFoundationforDisabledChildren.Writeane-mailtotheorganizationto
Duchennemusculardystrophyisahorribledisease.Afflictingmainlyboys,itweakenstheirmusclesandeventuallyconfinesthem
随机试题
是过度集权经济而非气候变化,导致s国自其政府掌权以来农业歉收。S国的邻国T国,经历了同样的气候条件,然而,其农业产量一直在增加,尽管S国的一直在下滑。以下哪项如果为真,将最能削弱以上论证?
向6位专家发函征求意见,让每一位专家对3项指标的权重进行分配,第一轮调查结果如表1(表中数据为权重):现在要将第一轮权重调查的统汁结果按表2形式反馈给其中的第6位专家。请在表2中的空缺处填写出相应的统计结果,并写出主要的计算公式或计算过程及其结果。(结
下列哪项是轻症急性胰腺炎治疗的最根本措施
A.阴道动脉B.阴部内动脉C.痔中动脉D.子宫动脉宫体支E.子宫动脉的宫颈.阴道支阴道上段的血供来自
下列属于内部监督的是()。
甲公司有锅炉和供电两个辅助生产车间,分别为基本生产车间和行政管理部门提供蒸汽和电力,两个辅助生产车间之间也相互提供产品。2013年9月份的辅助生产及耗用情况如下:(1)辅助生产情况(2)各部门耗用辅助生产产品情况
在主观评价对象的集合中的一个或者以个体为基准把各个评价对象与基准进行比较,然后确定每个评价对象在集合中所处的位置。这种教学评价是()。
在班级管理中,班主任是班级的()
根据宪法和民族区域自治法,下列关于民族自治地方自治权的说法正确的有()。
设计软件结构是在软件生命周期的( )。
最新回复
(
0
)