Genetic drift is a random change in gene frequency arising Genetic drift through chance alone. It tends to be more apparent in small populations allele frequencies drift away from their starting values, increasing, decreasing or fluctuating up and down. It occurs because there is an element of chance in which individuals and which gametes will produce offspring and which individuals will die before reproducing Random changes in allele frequency can lead to fixation and the progressive loss of genetic variation from the population Genetic When a population undergoes an abrupt contraction in numbers bottleneck this is accompanied by a change in gene frequencies and a decline in the total genetic variation. Genetic drift in the small population during the bottleneck results in the loss of genetic variation. Although population numbers may recover, genetic variation will remain low for many generations
Genetic drift Genetic drift is a random change in gene frequency arising through chance alone. It tends to be more apparent in small populations allele frequencies drift away from their starting values, increasing, decreasing or fluctuating up and down. It occurs because there is an element of chance in which individuals and which gametes will produce offspring and which individuals will die before reproducing. Random changes in allele frequency can lead to fixation and the progressive loss of genetic variation from the population. Genetic bottleneck When a population undergoes an abrupt contraction in numbers, this is accompanied by a change in gene frequencies and a decline in the total genetic variation. Genetic drift in the small population during the bottleneck results in the loss of genetic variation. Although population numbers may recover, genetic variation will remain low for many generations
建立者效应 建立者效应描述由一个或几个个体建立新种群,导致 低水平的遗传变异和在亲本种群中稀少的等位基因的 经常不成比例的数量。人类中特定遗传病的高发病率 可归因于建立者效应 相关主题 适应(B1) 稀有物种、生境损失和灭绝(V1)
建立者效应 建立者效应描述由一个或几个个体建立新种群，导致 低水平的遗传变异和在亲本种群中稀少的等位基因的 经常不成比例的数量。人类中特定遗传病的高发病率 可归因于建立者效应。 相关主题 适应（B1） 稀有物种、生境损失和灭绝（V1）