第72页 Chapter 3
lucy & mary (求效率)
- 章节名:Chapter 3
- 页码:第72页
Another kind of preexisting genetic variation would have consisted of balanced polymorphisms. Balanced polymorphisms occur within a population when the population maintains two different alleles of a gene, and the reason the polymorphism can be stable is that heterozygous individuals will have greater fitness than homozygous individuals. A heterozygote advantage exists, for example, in sickle cell and other malaria defenses. There are also allele that have positive effects when rare, but whose advantages decrease as they become common, eventually becoming negative (this is called frequency-dependent selection). Some of the most interesting examples involve behavior and lend themselves to a game-theory analysis. hawk-dove game*
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第46页 Chapter 2
Most viruses (which are basically just bags full of DNA or RNA) slip into cells and the...
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第56页 Chapter 2
So, it could be the case that as the modern humans moved north and came into contact wi...
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第72页 Chapter 3
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