她还说，这也可能是由于世界不同地方的结核分枝杆菌种群的遗传差异造成的。
It could also be caused by genetic differences between M. tuberculosis populations in different parts of the world, she adds.
研究表明不同地理种群的褐飞虱的致害性与其为害特性并不完全一致。
These results indicate that difference in virulence and damage characteristics could be found in different geographical populations of BPH.
UPGMA和NJ法构建的种群间分子系统树基本一致，结果表明不同地理种群之间存在一定程度的遗传差异。
Molecular phylogenetic tree constructed by UPGMA and NJ method suggested that there were some genetic variation among different geographic population.
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