首页
登录
职称英语
The evolution of sex ratio has produced, in most plants and animals with se
The evolution of sex ratio has produced, in most plants and animals with se
游客
2023-11-18
68
管理
问题
The evolution of sex ratio has produced, in most plants and animals with separate sexes, approximately equal numbers of males and females. Why should this be so? Two main kinds of answers have been offered. One is couched 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 opposite sex. This is essentially a "group selection" argument. The other, and in my view correct, type of answer was first put forward by Fisher in 1930. This "genetic" argument starts from the assumption that genes can influence the relative numbers of male and female offspring produced by an individual carrying the genes. That sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene copies transmitted. Suppose that the population consisted mostly of females, and then an individual who produced sons only would have more grandchildren. In contrast, if the population consisted mostly of males, it would pay to have daughters. If, however, the population consisted of equal numbers of males and females, sons and daughters would be equally valuable. Thus a one-to-one sex ratio is the only stable ratio; it is an "evolutionarily stable strategy". Although Fisher wrote before the mathematical theory of games had been developed, his theory incorporated the essential feature of a game that the best strategy to adopt depends on what others are doing.
Since Fisher’s time, it has been realized that genes can sometimes influence the chromosome or gamete in which they find themselves so that the gamete will be more likely to participate in fertilization. If such a gene occurs on a sex-determining (X or Y) chromosome, then highly aberrant sex ratios can occur. But more immediately relevant to game theory are the sex ratios in certain parasitic wasp species that have a large excess of females. In these species, fertilized eggs develop into females and unfertilized eggs into males. A female stores sperm and 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 female to produce equal numbers of sons and daughters. Hamilton, noting that the eggs develop within their host--the larva of another insect--and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably cogent analysis. Since only one female usually eggs in a given larva, it would pay her to produce one male only, because this one could fertilize all his sisters on emergence. Like Fisher, Hamilton looked for an evolutionarily stable strategy, but he went a step further in recognizing that he was looking strategy. [br] It can be inferred from the passage that the mathematical theory of games ______.
选项
A、has been developed by scientists with an interest in genetics
B、is useful in explaining some biological phenomenon
C、got some inspiration from the work of Fisher
D、emphasize the optimization of the total sum
答案
B
解析
推理判断题。本题需要对文章综合理解。Fisher和Hamilton的论断都符合数学运筹的游戏规则,虽然前者无意识的运用,后者则完全依据这种理论,所以说游戏的数学规则在解释生物现象上非常有用。
转载请注明原文地址:https://tihaiku.com/zcyy/3198100.html
相关试题推荐
Whatarethewaysanimalscommunicate?[br][originaltext]Whenwethinkof
Whatarethewaysanimalscommunicate?[br][originaltext]Whenwethinkof
DrMeekwrote:"Asistruewithmostanimals,thewolfisanopportunistwhilst
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals
Biologically,thereisonlyonequalitywhichdistinguishesusfromanimals
NightFloweringPlantsEveningPrimro
EventhoughAfricangamepreserveshavesavedmanyanimals,thereare______tha
InstructiononaseedpackageNASTURTIUMJEWELMIXEDCOLORSPLANTSDWARFWITH
InstructiononaseedpackageNASTURTIUMJEWELMIXEDCOLORSPLANTSDWARFWITH
InstructiononaseedpackageNASTURTIUMJEWELMIXEDCOLORSPLANTSDWARFWITH
随机试题
Earlyinthesixteenthcentury,FrancisBaconproposedthatscienceconsisted
Languageisnotmerelysomethingthatisspreadoutinspace,asitwas—ase
Accordingtothenews,whichstatementisTRUE?[originaltext]Chinesesharep
Accordingtothenarrator,whichkindofdogsisthoughttohaveasenseofhumo
下列各项中,叙述错误的是A.所根为井 B.所溜为荥 C.所注为输 D.所行
患者,男,30岁。刺激性咳嗽一个月,头痛10天。胸片显示左肺门块状阴影:颅脑CT
危机介入模式中,危机的发展一般可以分为()。A.危机 B.解组 C.恢复
全面依法治国,建设一支忠于党、忠于国家、忠于人民、忠于法律的社会主义法治工作队伍
某隧道为上、下行双线四车道隧道,其中左线长858m,右线长862m,隧道最大埋深
排水通气管在经常有人停留的平屋顶上,通气管应高出屋面(),并应根据防雷要求
最新回复
(
0
)