The migration could hamper more genetic differentiation among different geographic populations.
迁飞阻碍了不同地理种群间的遗传分化。
Due to spatial variation of selection regime, morphological, physiological and life history traits of widely-distributed species may vary genetically among geographic populations.
在自然选择压力空间变化的作用下，广布种的形态、生理和生活史特征往往在不同地区的种群间发生地理变异。
The nature of the geographic separation necessary to isolate populations depends entirely on the biology of the organism and its potential for dispersal.
地理上的隔离是隔离种群所必需的条件，且地理隔离的性质完全取决于生物体的生物学特性及其分散的可能性。
This is because there are so many variables in human physiology that results are often skewed by small populations of people who live in and around the same geographic location.
这是因为很多生活在同一地理位置的小群体导致结果起了变化。
Cluster sampling, in which random "clusters" of households are measured, is used in populations that are not in even or structured Settings but are spread unevenly over a large geographic area.
分组抽样，即测量随机的家庭“组”，一般用于不均匀地分散在较大面积地理区域的人群。
That allowed the researchers to determine which geographic groups of modern dogs were closest to ancestral populations genetically.
因此研究人员能够分析出哪些现代犬只的地理群落在基因上最接近其祖先群体。
Conclusion: the same gene mutation may play different roles in different populations because of the differences of geographic environment, ethnic lines and living conditions.
结论：由于地理环境、种族和生活条件的不同，相同的基因突变在不同的人群中所起的作用可能不同。
We suggest that the broad geographic differences in herring populations are adaptive, evolving in response to local prey resources, competitive and climate regimes.
因此我们提出广泛的地理差异是鲱鱼族群为了适应、演化以反应当地饵料资源、竞争力以及气候状况等等。
Occurring in separate, nonoverlapping geographic areas. Often used of populations of related organisms unable to crossbreed because of geographic separation.
异域种的分布在不同地区的，分布区不重叠的，常指由于地理分隔而不能杂交的相关生物的族群。
We conducted an extensive field survey of current geographic distribution of their natural range, and in situ and ex situ conservation status of the remnant populations of the two genera.
本研究通过野外调查，了解了中国秤锤树属与长果安息香属植物的地理分布、濒危现状及其迁地保护状况。
The American Anthropological Association in 1998 stressed that neighboring populations interbreed and that physical traits tend to vary gradually rather than abruptly over geographic areas.
1998年美国人类学协会为了邻近种族的杂交而生理上的特征有非常逐渐而不是突然地跨过地理区域感到很紧张。
The American Anthropological Association in 1998 stressed that neighboring populations interbreed and that physical traits tend to vary gradually rather than abruptly over geographic areas.
1998年美国人类学协会为了邻近种族的杂交而生理上的特征有非常逐渐而不是突然地跨过地理区域感到很紧张。
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