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
The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal number of males an
The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal number of males an
admin
2013-11-12
51
问题
The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal number of males and females. Why should this be so? Two main kinds of answers have been offered. One is【C1】______in terms of advantage to population. It is argued that the sex ratio will evolve so as to maximize the number of meetings between individuals of the【C2】______sex. The other type of answer was first put forward by Fisher in 1930. The "genetic" argument starts from the【C3】______that genes can influence the relative numbers of male and female【C4】______produced by an individual carrying the genes. Suppose that the population consisted mostly of females, it would pay to have sons. In contrast, if the population consisted mostly of males, it would have daughters. If, however, the population consisted of【C5】______numbers of males and females, sons and daughters would be equally valuable. Thus a one-to-one sex ratio is the only【C6】______ratio; it is an "evolutionarily stable strategy". Although Fisher wrote this, before the mathematical theory of games had been developed, his theory【C7】______the essential feature of a game—that the best strategy to adopt depends on what others are doing.
More immediately relevant to game theory are the sex ratios in certain parasitic wasp(寄生蜂)species that have a large excess of females. In these species, fertilized eggs develop into females and unfertilized eggs into males. A female can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized. By Fisher’s argument, it should still pay a【C8】______to produce equal numbers of sons and daughters. Hamilton, noting that the eggs develop within their host and that the newly emerged adult wasps mate immediately and【C9】______. offered a remarkably reasonable analysis. Like Fisher, Hamilton looked for an【C10】______stable strategy, but he went a step further in recognizing that he was looking for a strategy.
A)female I)predecessor
B)updated J)offspring
C)stable K)disperse
D)incorporates L)couched
E)invariably M)male
F)evolutionarily N)opposite
G)assumption O)homogeneous
H)equal
【C9】
选项
答案
K
解析
and提示所填词可能是副词,与immediately共同修饰mate,也可能与mate并列,是一个动词。E),F)两个副词不符合语境。此处主要讲的是the newly emerged adult wasps出生后的一系列动作,所以选项K)disperse与mate并列。
转载请注明原文地址:https://kaotiyun.com/show/Vo17777K
0
大学英语六级
相关试题推荐
AsdefinedbyGreekphilosophersandancientIndianphilosophers,musicisviewedastonesorderedhorizontallyasmelodiesand
AsdefinedbyGreekphilosophersandancientIndianphilosophers,musicisviewedastonesorderedhorizontallyasmelodiesand
A、WhereUFOscame.B、TheHeaven.C、TheRiverofHeaven.D、Lightinthesky.C细节题。由四个选项可以推测,本题的内容和某事物有关。文中提到银河系远离地球,无法用肉眼看到,从“To
A、Threebooks.B、Fivebooks.C、Sixbooks.D、Atmosttenbooks.D细节题。浏览选项可知此题考查可借阅图书的数量。对话的结尾处提到uptotenforgraduates,因此答案选D。
AccordingtoBT’sfuturologist,IanPearson,theseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmil
AccordingtoBT’sfuturologist,IanPearson,theseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmil
AccordingtoBT’sfuturologist,IanPearson,theseareamongthedevelopmentsscheduledforthefirstfewdecadesofthenewmil
Asawisemanoncesaid,weareallultimatelyalone.ButanincreasingnumberofEuropeansarechoosingtobesoataneverear
______(如果不是因为这里打八折).Iwouldhaveprobablypassedonthisshoppingmallknownforitshighpricesandsuperbtaste.
ShouldWeEmbraceCyberspeak?1.越来越多的网络用语渗透到日常口语和书面语中2.有人认为这是语言发展的结果,也有人认为这是对语言的污染3.我的看法
随机试题
以下哪项是SLE病人最典型的面部表现()
口腔科的牙钻结构复杂,且经常接触破损的黏膜,常有血液污染。牙钻属于
呼吸道的腔面被覆
偏头痛的预防性治疗药物是()
以协议方式出让国有土地使用权的出让金不得高于按国家规定所确定的最低价。()。
为提高饱和软土地基的承载力以及减少地基的变形,宜使用()处理方法。
劳动法律关系的主要形态是()
技能
Businesspeoplefindthatsomejobstakethemawayfromhomeforlongerthanafewdays.Thosewhofindthemselvesatanewjob
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedin
最新回复
(
0
)