Eventually the subpopulations become so genetically distinct that they cannot interbreed even if the physical barriers between them were removed.
最终，这些亚种群在基因上变得如此不同，以至于即使消除了它们之间的物理障碍，它们也无法杂交。
High rates of straying can be problematic because misdirected fish may interbreed with the existing stock to such a degree that any local adaptations that are present become diluted.
高偏离率可能是一个问题，因为被误导的鱼可能会与现有种群杂交，而这种杂交的程度会稀释现有的任何当地适应能力。
These species do not interbreed.
这些物种不能杂交。
You could have two genuine species, whose members cannot interbreed, but whose genomes are very similar.
你可能有两个纯正的物种，两者无法通婚，不过他们的基因组非常相近。
Modified organisms may interbreed with natural organisms and out-compete them, leading to extinction of the original organism or to other unpredictable environmental effects.
被改造过的生物体和自然生物体混配，从而更具竞争力，使原有物种走向灭绝，或给环境带来未知的影响。
Since the birds interbreed they cannot be classed as different species.
由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。
Since the birds interbreed they cannot be classed as different species .
由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。
Since the birds interbreed they cannot be classed as different species .
由于这些鸟进行杂交繁殖，不能把它们归为不同的物种。
应用推荐