影响春小麦株高自交后代遗传变异的因素Ⅰ——遗传距离

A factor of the genetic variation of self progeny in the spring wheat heightⅠ——genetic distance

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,集团混种群体自交后代的最大基因型值和最小基因型值的差称遗传距离.用株高遗传距离表示株高遗传变异的大小.最大基因型值和最小基因型值保持不变,集团混种群体自交后代的遗传距离保持不变(2Σa).用株高遗传均差表示株高遗传距离的相对大小.用t-测验分析表明不同集团混种群体自交后代间遗传均差有无显著差异:采用2个样本平均数相比较的假设测验——成组数据的平均数比较,分析两两自交后代间遗传均差,全部自交后代符合各代间遗传均差保持不变的假设;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均差,50%自交后代符合各代间遗传均差保持不变的假设,50%自交后代不符合自交后代的遗传均差保持不变的假设.

In the conditions of the additive inheritance model and Mendel＇s law, which answered for the law of independent assortment, and with no linkage inheritance or gene interaction, the mixed group self progeny of the maximum genotypic values reduce minimum genotypic values was called the genetic distance. The genetic distance stayed the same（=2∑a）. The genetic distance of the wheat height denoted the genetic variation, the genetic distance of the wheat height was not measured directly, the genetic average deviation denoted the genetic distance. T-test analyzes resulted that the 50 % self progeny of mixed group accorded with the genetic average deviation to stay the same, that the 50% self progeny of mixed group did not accord with the genetic average deviation to stay the same.