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
Single-parent Kids Do Best Single mums are better at raising their kids than two parents—at least in the bird world. Mother
Single-parent Kids Do Best Single mums are better at raising their kids than two parents—at least in the bird world. Mother
admin
2014-09-12
81
问题
Single-parent Kids Do Best
Single mums are better at raising their kids than two parents—at least in the bird world. Mother zebra finches have to work harder and raise fewer chicks on their own, but they also produce more attractive sons who are more likely to get a mate.
The finding shows that family conflict is as important an evolutionary driving force as ecological factors such as hunting and food supply.【B1】______
In evolutionary terms, the best strategy for any parent in the animal world is to find someone else to care for their offspring, so they can concentrate on breeding again. So it’ s normal for parents to try to pass the buck to each other. But Ian Hartley from the University of Lancaster and his team wondered how families solve this conflict, and how the conflict itself affects the offspring.
【B2】______They compared single females with pairs,by monitoring the amount of food each parent collected, and removing or adding chicks so that each pair of birds was raising four chicks, and each single mum had two—supposedly the same amount of work.
But single mums, they found, put in about 25 per cent more effort than females rearing with their mate. 【B3】______"The offspring suffer some of the cost of this conflict," says Hartley.
The cost does not show in any obvious decrease in size or weight, but in how attractive they are to the opposite sex. When the chicks were mature, the researchers tested the "fitness" of the male offspring by offering females their choice of partner.【B4】______
Sexual conflict has long been thought to affect the quality of care given to offspring, says zoologist Rebecca Kilner at Cambridge University, who works on conflict of parents in birds. "But the experimental evidence is not great. The breakthrough here is showing it empirically. "
More surprising, says Kilner, is Hartley ’ s statement that conflict may be a strong influence on the evolution of behaviour, clutch size and even appearance. "People have not really made that link," says Hartley. A female’ s reproductive strategy is usually thought to be affected by hunting and food supply. 【B5】______
A. To avoid being exploited, mothers with a partner hold back from working too hard if the father is being lazy, and it’ s the chicks that pay the price.
B. To find out, they measured how much effort zebra finch parents put into raising their babies.
C. Those males reared by single mums were chosen more often than those from two-parent families.
D. With two parents around, there’ s always a conflict of interests, which can have a detrimental effect on the quality of the offspring.
E. Kilner says conflict of parents should now be taken into account as well.
F. It turned out that single mums had greater influence on their offspring.
【B1】
选项
答案
D
解析
此空之前的内容介绍了家庭冲突也是进化的主要推动力之一。此空处应具体地描述家庭冲突对进化的影响,故选D。
转载请注明原文地址:https://kaotiyun.com/show/96hd777K
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
StressCanMakeYouSickScientistsarenowstudyinganewfieldofresearchwhichiscalledpsychoimmunology(心理免疫学).Itisb
StressCanMakeYouSickScientistsarenowstudyinganewfieldofresearchwhichiscalledpsychoimmunology(心理免疫学).Itisb
Accordingtothepassage,whichofthefollowingstatementsisNOTtruewhenapersonisinastateofdeeprelaxation?Inthe
AHistoryofAspirinBBadThingsaboutAspirinCOriginofAspirinDGoodThingsAboutAspirinEHowAspirinWorksinthe
Manyoftheirideasarebeingincorporatedintoorthodoxmedicaltreatment.
Humanfacialexpressionsdifferfromthoseofanimalsinthedegreetowhichtheycanbedeliberatelycontrolledandmodified.
Thestorywastouching.
HeartAttackThroughouttheUnitedStates,andespeciallyinbigcitiesandruralareas,tensofthousandsofpeoplewithhearts
Beforeanyperiodofexerciseitiswellworthspendingtwoorthreeminuteswarmingupwithaseriesofsimplestretchingexerc
FinefreshwaterpearlsarefoundinthemainstreamandthetributariesoftheMississippiRiver.
随机试题
一级耐火等级民用建筑楼板的耐火极限应为()h。
Surfing(浏览)theInternetcanbeasaddictive(上瘾的)asdrugs,alcoholorgambling,aresearcherfromUniversityofPittsburghsaidl
当归在生化汤中的功用为( )。当归在苏子降气汤中的功用为( )。
A.抑制外周前列腺素的合成B.不影响P物质的释放C.阻断痛觉神经冲动的传导D.直接作用于痛觉感受器,降低其对致痛物质的敏感性E.抑制中枢神经系统,引起痛觉消失吗啡最主要的镇痛作用机制是()
目前我国房地产经纪业,最主要的代理业务是()。
()指劳动者从事职业活动或进行生产管理过程而经常或定时停留的地点。
曙光初现形态一般出现在下跌市势中,是一种可能()的K线形态。
下列固定资产折旧方法中,属于加速折旧方法的是()。
贺国强同志指出,“年轻干部要修身、勤学、敬业、自律,切实担负起党和人民赋予的光荣使命”,谈谈你对这句话的理解。
根据下表,回答下列问题。2015年与2014年相比,主营业务收入增长最快的是()。
最新回复
(
0
)