农业科学与技术(英文版)
農業科學與技術(英文版)
농업과학여기술(영문판)
AGRICULTURAL SCIENCE & TECHNOLOGY
2010年
3期
4-6,46
,共4页
生殖隔离%适合度%突变基因%杂合子%分岔点
生殖隔離%適閤度%突變基因%雜閤子%分岔點
생식격리%괄합도%돌변기인%잡합자%분차점
Reproductive isolation%Fitness%Mutant gene%Heterozygote%Branch point
通过用RR、Rr和rr 3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.
通過用RR、Rr和rr 3種基因型的適閤度之比量化R與r基因在後代中的頻率,計算r的頻率逐代縯變的分岔點,研究隨機交配群體中的雜閤子適閤度低于純閤子適閤度的突變基因r在群體中的逐代積纍過程.揭示瞭R與r在遺傳中的不相容性;遺傳漂變能使r在新群體中有較高的頻率,超過分岔點,最終形成生殖隔離;同時生物進化的動力僅有突變、遺傳漂變、自然選擇這3箇條件還不夠,還需要有雜閤子適閤度低于純閤子適閤度的突變基因,即原有群體的遺傳揹景對新突變的排斥作用.
통과용RR、Rr화rr 3충기인형적괄합도지비양화R여r기인재후대중적빈솔,계산r적빈솔축대연변적분차점,연구수궤교배군체중적잡합자괄합도저우순합자괄합도적돌변기인r재군체중적축대적루과정.게시료R여r재유전중적불상용성;유전표변능사r재신군체중유교고적빈솔,초과분차점,최종형성생식격리;동시생물진화적동력부유돌변、유전표변、자연선택저3개조건환불구,환수요유잡합자괄합도저우순합자괄합도적돌변기인,즉원유군체적유전배경대신돌변적배척작용.
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 can make r have 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.