1. 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。
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2. 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.
12. For example, groups of baboons that usually live apart as apparently separate species sometimes aggregate and interbreed, muddying their classification.
13. 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。
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14. The Melanesians took a different course. After a single interbreeding with Neanderthals, Dr. Akey found, their ancestors went on to interbreed just once with Denisovans, as well.
15. 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.
16. 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.