有些科学家提出，我们从母体遗传来的线粒体DNA很少发生变异，说明瓶颈发生在不久以前祖先走出非洲的时候。
Some researchers proposed that the lack of variation in our maternally inherited mitochondrial DNA suggested these bottlenecks took place as our ancestors spread out of Africa relatively recently.
由于母体的可遗传变异使得这些特殊的细胞不可能被用于繁殖，但是能够帮助科学家总结出繁殖过程。
Although this particular batch of cells is unlikely to be used for assisted reproduction because of the donor's heritable mutation, it will help scientists work the process out.
母体，随机样本。样本统计， 样本平均数和变异数的动差。
Populations, random samples. Sample statistics, moments of the sample mean and variance.
这可能是由于这种相关性往往被资源获取能力的变异或者母体效应掩盖。
The reason may be the inter-individual variation in resource acquisition and the maternal effects.
本文采用AFLP分子标记，以来自同一母体种群并在5种寄主植物上隔离饲养21个月、29个月和36个月的烟粉虱种群为样本，分析不同寄主和不同饲养时间样本的遗传变异。
The AFLP marker was used to analyse the genetic variation among different samples which were rearing 21 months, 29 months and 36 months separately collected from 5 host plants.
正态母体特征值（母体均值、百分位值、百分率、标准差和变异系数等）的检验是工程中常见的问题。
The normal population characteristics, such as the mean, standard deviation, percentile, percentage and coefficient of variation, are often tested in engineering.
正态母体特征值（母体均值、百分位值、百分率、标准差和变异系数等）的检验是工程中常见的问题。
The normal population characteristics, such as the mean, standard deviation, percentile, percentage and coefficient of variation, are often tested in engineering.
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