不同初始基因频率下原位保种群体遗传漂变的计算机模拟

Computer simulation of genetic drift in in- situ preservation of the population under the different initial gene frequencies

为了研究不同初始基因频率下闭锁群体基因频率、基因型频率在50个世代中的变化,试验采用计算机模拟的方法对实行随机留种、随机交配、世代不重叠、群体间个体无迁移、整个保种过程中基因不发生突变的原位保种群体进行模拟研究。结果表明:初始基因频率过高(0.9)或过低(0.1)时,基因由于世代间随机遗传漂变而被固定或丢失的风险越高;而初始基因频率为中等水平(0.3,0.5,0.7)时,基因被固定或丢失的风险相对较低,至整个模拟结束均未出现被固定或丢失的情况。说明初始基因频率过高或过低均不利于基因的保存,而中等水平的初始基因频率对保护群体基因不被固定或丢失是有利的。

To study the changes of gene frequency and genotype frequency of the closed population under different initial gene frequencies in 50 generations, a computer simulation was used to stimulate and study the in situ conservation groups without gene mutation during the processess of random seeding, random mating, non -overlapping generations, individuals without immigration between the generations, and entire seed conservation. The results showed that the danger of gene loss or fixation from random genetic drift in generations would be higher when initial gene frequency were too high （0.9） or too low （0.1）, but when initial gene frequencies were at the medium levels （0.3, 0.5, 0. 7 ）, the danger of gene loss or fixation was relatively lower. The results indicate that the initial gene frequency is too high or too low not to be conducive to the preservation of genes, but the initial gene frequency at the medium levels is advantageous for protecting the genes not to be fixed or lost in the populations.