This creates two new groups, unable to come together and interbreed. ... If a new favorable trait originates in Group A, it cannot spread to Group B, because the two groups are physically separated and cannot interbreed; gene flow has been blocked. The two groups will continue to evolve independently of one another.
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www.illogicaloperation.com/2009/01/16/speciation/
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Cell Biology & Development (with a little fun included). ... In allopatric speciation, a single population is divided into two or more physically separate populations. ... Over time two daughter species may be "reunited", but be unable to interbreed - reproductive isolation has occurred and one species has become two.
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virtuallaboratory.colorado.edu/Biofundamentals/lectureN...
virtuallaboratory.colorado.edu/Biofundamentals/lectureNotes/Topic1E_Evo.htm
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Lesson 3 – Origin of species ... 47. Donkeys and horses can interbreed and produce offspring called mules that live normal lifespans but are sterile.
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www.kbcc.cuny.edu/academicDepartments/bio/CrossingBound...
www.kbcc.cuny.edu/academicDepartments/bio/CrossingBoundaries0405/LakrimNonPSD/Webpages/3A.htm
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Ring species consist of a chain of interbreeding populations that surround some physical barrier, like a mountain range or a desert valley, with the terminal two populations unable to successfully interbreed. ... Gene flow between the two populations is interrupted through mechanisms other than simply being physically separated.
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www.rci.rutgers.edu/~wayner/Principles%20of%20Ecology%2...
www.rci.rutgers.edu/~wayner/Principles%20of%20Ecology%20course/Speciation.pdf
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Lacking physical size, the male nerds are routinely physically abused by the jocks and, ... The two population extremes have become two separate populations due to the elimination of the intermediates, unable to interbreed because of physical, though not necessarily genetic, incompatibility. Over time,
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www.reddit.com/r/science/comments/9zdfo/rscience_whats_...
www.reddit.com/r/science/comments/9zdfo/rscience_whats_the_craziestfunniest_analogy_youve/
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PhysOrg.com science forums and latest news discussions ... If you consider species that are those animals unable to interbreed due to physical or behavioral function, then yes- there are many dogs physically or behaviorally unable to breed with wolves, their ancestral species.
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lofi.forum.physorg.com/Human-Influence-On-Evolution._26...
lofi.forum.physorg.com/Human-Influence-On-Evolution._26613.html
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As an example: In pre-zygotic barriers, there are mechanisms that prevent a zygote from being formed, such as: Ecological isolation – physically separated, Behavioral isolation – mating calls, Mechanical isolation – physically unable, Gametic isolation – gametes do not fuse.
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en.allexperts.com/q/Biology-664/2008/6/inter-species-br...
en.allexperts.com/q/Biology-664/2008/6/inter-species-breeding-1.htm
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; The Case for Physically Separated Bike Lanes (8:30 running time) ... 79 comments on The Case for Physically Separated Bike Lanes ... but biked everywhere due to separated lanes. Same cost and safer, it will just take a while to percolate to all the traffic engineers. This is simply a no-brainer.
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nyc.theoildrum.com/node/2416
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When, for example, part of the population is segregated – by, say, a mountain range, river or sea channel – and if the barrier is maintained for a sufficient length of time, the two populations will change enough to become unable to interbreed.
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darwin.britishcouncil.org/themes/how-do-new-species-app...
darwin.britishcouncil.org/themes/how-do-new-species-appear
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