| 单词 | Random genetic drift |
| 释义 |
Random genetic drift
原声例句
双语版 TED-Ed 演讲精选 And though the proportions of different blood types vary between human populations, scientists aren't sure why they evolved; perhaps as protection against blood born diseases, or due to random genetic drift. 虽然不同血型的比例在人群中大不相同，科学家也不能确定为什么它们会这样发展；也许是为了防止血液传播疾病，或者只是任意的基因漂流。 经济学人 Science and technology This happens because of a process known as random genetic drift, says Dr Wilson, whereby some genetic variants become more common and others are lost. 威尔逊博士说， 这种情况的发生是因为一种被称为随机遗传漂变的过程，在这一过程中， 一些遗传变异变得更加普遍， 而另一些则消失了。
中文百科
遗传漂变 Genetic drift（重定向自Random genetic drift）
    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Random genetic drift）
    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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