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) chromo-some, 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 in sect——and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably co gent 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.
The author suggests that the work of Fisher and Hamilton was similar in that both scientists ______.
A.conducted their research at approximately the same time
B.sought to manipulate the sex ratios of some of the animals they studied
C.sought an explanation of why certain sex. ratios exist and remain stable
D.studied reproduction in the same animal species
第1题
根据实际需要,对造林工程的有关附属项目进行规划设计是()的任务之一。
A.造林区划
B.造林规划
C.造林调查设计
D.造林施工设计
第7题
十二五”规划纲要提出,全面实施___造林绿化工程和生态修复工程。()
A.“青山绿水”
B.“绿满八桂”
C.“花红柳绿”
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