随机交配群体隐性致死纯合基因型出现的平方Logistic模型  

Square Logistic Model for the Appearance of Lethal Recessive Homozygous Genotype in Random Mating Population

作　　者：韦文惠[1] 王子平[2] 林建国[1] 蔡润[3] 李大林[1] 

机构地区：[1]柳州职业技术学院基础部,广西柳州545006 [2]广西工学院科学技术处,广西柳州545006 [3]上海交通大学农业与生物学院,上海200240

出　　处：《安徽农业科学》2008年第27期11625-11627,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金(30671111)

摘　　要：从玉米的随机交配特点出发,借助数学理论分析杂种优势和白化苗之间的关系,推导出隐性纯合致死基因型出现的平方Logistic模型。该模型显示,杂种优势能确定群体的遗传结构及比例;认为突变产生的致死基因a,只要Aa存在杂种优势,aa在各代玉米苗期的比例呈现一个类似Logistic曲线的增长过程,直至平衡。aa在平衡状态的比例由AA与Aa的适合度之比决定。杂种优势能使群体的遗传多样性得以长久保持。From the random mating population of rice,the relationship between heterosis and albino seedling was analyzed by means of mathematical theory,further the square logistic model for the appearance of lethal recessive homozygous genotype was deduced.The model shows that heterosis can determine the genetic structure and proportion of population.It approves,that the proportion of aa in each generation of maize seedlings show a similar Logistic curve in growth process till equilibrium,so long as Aa containing lethal gene a from mutation presents heterosis.The ratio of equilibrium state of aa is determined by the ratio of AA-Aa fitness.Heterosis is helpful for the keeping of genetic diversity of population.

关 键 词：适合度 隐性致死 杂种优势 随机交配 平衡 

分 类 号：S119[农业科学—农业基础科学]