影响春小麦株高自交后代遗传变异的因素Ⅱ——基因型概率

A factor of the genetic variation of self progeny in the spring wheat heightⅡ——genotypes probability

在加性遗传模式和符合孟德尔定律(符合分离定律和独立分配定律,没有连锁遗传和基因互作)的条件下,推导集团混种群体自交后代的遗传变异大小:随着自交代数的增加,基因型概率发生改变,遗传方差增加.采用单个样本平均数的假设测验分析两两自交后代间遗传方差:25%自交后代间遗传方差符合自交后代的遗传方差受基因型概率改变影响的假设;75%自交后代间遗传方差不符合自交后代的遗传方差受基因型概率改变影响的假设.采用单个样本平均数的假设测验分析两两自交后代间遗传方差保持不变的假设:50%自交后代符合自交各代间遗传变异保持不变的假设;50%自交后代不符合自交后代的遗传变异保持不变的假设.集团混种群体自交后代的遗传变异大小,除了受到遗传距离保持不变和基因型概率改变的影响以外,还受到其他因素的影响.

In the conditions of the additive inheritance model and Mendel law, which answered for the law of independent assortment, and with no linkage inheritance or gene interaction, with the increase of the selling generations,the genetic variance increased, the genotypes probability also changed. T-test analyzes results.the 25% self progeny of mixed group accorded with the genetic variance to change,the 75% self progeny of mixed group did not accord with the genetic variance to change. Besides the unchanged genetic distance and the difference probability of genotype, the genetic variation of the mixed group self progeny was also affected by other factors, which needed further researches.