摘要
通过用RR、Rr和rr3种基因型的适合度之比,量化R与r基因在后代中的频率,计算r的频率逐代演变的分岔点,研究随机交配群体中的杂合子适合度低于纯合子适合度的突变基因r在群体中的逐代积累过程。揭示了R与r在遗传中的不相容性;遗传漂变能使r在新群体中有较高的频率,超过分岔点,最终形成生殖隔离;同时生物进化的动力仅有突变、遗传漂变、自然选择这3个条件还不够,还需要有杂合子适合度低于纯合子适合度的突变基因,即原有群体的遗传背景对新突变的排斥作用。
According to the fitness of heterozygote was lower than homozygote among panmictic population, the process of generational accumulate of mutant gene r was considered. Branch point of r’ s frequency by generational evolution which revealed the hereditary incompatibility between R and r, was worked out, and it was found that genetic drift could make r has higher frequency to surpass the branch point to form reproductive isolation. It was not enough to have the three conditions of mutation, genetic drift and natural selection to be the drive of biological evolution; hybrid weakness, the repelling interaction between the genetic background of original population and the new mutation, were also needed.
出处
《安徽农业科学》
CAS
北大核心
2010年第13期7148-7149,7174,共3页
Journal of Anhui Agricultural Sciences
基金
广西教育厅科研项目(200807MS065)
广西高校优秀人才资助计划项目"群体遗传中的数学建模"
关键词
生殖隔离
适合度
突变基因
杂合子
分岔点
Reproductive isolation
Fitness
Mutant gene
Heterozygote
Branch point
