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单词 Gene drift
释义

Gene drift

中文百科

遗传漂变 Genetic drift

(重定向自Gene drift)
蝴蝶的遗传漂变。某个蝴蝶族群有稳定的10只个体。由于某些原因,第一世代只有在框中的5只个体繁衍出后代。又由于偶然的原因,第二世代只有框中的2只个体留下后代。等位基因a在第三世代从族群中消失。

遗传漂变英语:genetic drift)现象,指当一个族群中的生物个体的数量较少时,下一代的个体容易因为有的个体没有产生后代,或是有的等位基因没有传给后代,而和上一代有不同的等位基因频率。一个等位基因可能(在经过一个以上的世代后)因此在这个族群中消失,或固定成为唯一的等位基因。。

一般情况下,族群的生物个体的数量越少,族群中基因就越容易发生遗传漂变。它和天择、突变、近亲繁殖等等都是影响等位基因频率的因素。

英语百科

Genetic drift 遗传漂变

(重定向自Gene drift)
Biologist and statistician Ronald Fisher
In this simulation, there is fixation in the blue
Ten simulations of random genetic drift of a single given allele with an initial frequency distribution 0.5 measured over the course of 50 generations, repeated in three reproductively synchronous populations of different sizes. In these simulations, alleles drift to loss or fixation (frequency of 0.0 or 1.0) only in the smallest population.

Genetic drift (also known as allelic drift or the Sewall Wright effect after biologist Sewall Wright) is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces. A population's allele frequency is the fraction of the copies of one gene that share a particular form. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.

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更新时间:2025/6/17 10:36:26