Evolutionary biologists believe that speciation, the formation of a new species, often begins when some kind of physical barrier arises and divides a population of a single species into separate subpopulations. 问题 句子分析(俗称“长难句分析”)是训练提高基础阅读能力的有效手段。我们通过对托福(TOEFL...
Evolutionary biologists believe that speciation, the formation of a new species, often begins when some kind of physical barrier arises and divides a population of a single species into separate subpopulations. Physical separation between subpopulations promotes the formation of new species because once ...
Evolutionary biologists believe that speciation, the formation of a new species, often begins when some kind of physical barrier arises and divides a population of a single species into separate subpopulations.Physical separation between subpopulationspromotesthe formation of new species because once the ...
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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...
Passage 13The Formation of New Species新物种形成 (重复2016.02.28) 基因突变导致物种生殖隔离,讲了各种导致生殖隔离的情形。如地理变化形成无法逾越的屏障,还说到当物种被分散成了小的部分就会更容易形成生殖隔离。 Passage 14 十八世纪的钢铁和交通 钢铁的发展推动了造船业等其他交通运输方式的进步,介绍了北纬30-...
With its gene pool isolated, a separate population can follow its own evolutionary course. 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 ...
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...