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The Formation of New Species Speciation is the process by which new species form. It begins with the isolation of two populations. If two populations are to become sufficiently distinct that interbreeding is difficult or impossible, then there must be relatively little gene flow (migration)...
这些机制分为两大类:(1)异地物种形成,其中两个种群在地理上相互分离;(2)同域物种形成,两个种群共享相同的地理区域。乍一看,同域物种形成似乎违反了种群隔离的原则,因为物种形成的种群生活在同一地区。然而,与基因流的隔离对物种形成至关重要。尽管这种隔离最常见的可能是由河流等物理屏障造成的,但如果生活在同一...
A. species B. populations C. ecosystems D. habitats 相关知识点: 试题来源: 解析 A。进化变化可以导致新物种的形成。选项 B“populations”是种群,不是进化变化的主要结果。选项 C“ecosystems”是生态系统,不是直接由进化变化形成的。选项 D“habitats”是 反馈...
In the formation of many species, the [#highlight2]initial[/highlight2] isolation of a population seems to have been a geographic barrier. This mode of evolving new species is called allopatric speciation. [#paragraph2]Many factors can isolate a population geographically. A mountain range may ...
thereby preventing population interbreeding.With its gene pool isolated, a separate population can follow its own evolutionary course.In the formation of many species, theinitialisolation of a population seems to have been a geographic barrier.This mode of evolving new species is called allopatric spe...
The Formation of New Species Speciation is the process by which new species form. It begins with the isolation of two populations. If two populations are to become sufficiently distinct that interbreeding is difficult or impossible, then there must be relatively little gene flow (migration) between...
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As for whether the findings can be applied to human babies of so-called “helicopter parents,” Bray was hesitant. “I think people can draw parallels(相似之处), but I think you also have to be careful because they are different species,” she said. She added, “The nice thing about...