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Reproductively Isolated.
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∙ 12y ago
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A population of animals is split in half by a river. Before speciation is completed the two halves are rejoined when a drought causes the river to run dry how would this impact the two populations?
the gene flow would increase (apex)orGene flow would increase between the two halves, and speciation would not occur.
How did the continental shift theory affect evolution?
The ultimate allopatric ( geographic ) speciation. If you had a population of quite similar organisms in a area that split the population into two or more populations when continental drift occurred you would have different mutations and changing environments putting selective pressure on two or more populations now.
What species concept should be used in the apple maggot fly case?
In the case of the apple maggot flies, it is an example of sympatric speciation. Two different populations occur in different niches where there is no gene flow between the two.
What are the 5 steps to Speciation?
There are no discrete steps to speciation. There are a number of boundary conditions that are met in most cases. Speciation is the result of any situation that leads to the genetic, behavioural and/or morphological divergence of subpopulations of the same species, which may in turn lead to a decline in interbreeding frequency. The causes for such divergence may vary. The clearest example of the principle is when two subpopulations become geographically isolated (for instance due to migration, floods or some other natural event), and diverge as a result of genetic drift. Once the two population have diverged to the degree that they would no longer produce fertile offspring together even if they were put back together again, we say that speciation has occurred.
How can a new species from?
To put it simply, new species can form when organisms within a population become so genetically different they can no longer reproduce with one another without generating harmful mutations. This can be caused by genetic drift and geographic isolation. Two populations of the same species who live in different parts of the world will diverge and go on separate genetic paths, until eventually the two populations become genetically different and branch off into two different species.
The process by which two populations become so different they can no longer interbreed?
Your answer is speciation
When is speciation is complete?
When the two populations can no longer interbreed.
Process in which isolated populations of the same species become new species is called?
In Sympathetic Speciation, a species evolves into a new species without any barriers that separate the populations.In Allopatric Speciation, a population divided by a barrier, each population evolves separately, and eventually two populations cannot successfully interbreed.
When speciation complete?
When the two populations can no longer interbreed.
What is the is the first step in allopatric speciation?
physical isolation of two populations
What happens when two populations have been reproductively isolated and can no longer breed?
Speciation
Why do geographic isolation cause speciation?
It prevents the two populations from interbreeding. :) -Apex-
How can reproductive isolation lead to speciation?
Reproductive isolation separates the reproduction of one population into two populations. Over time after generations, the two separate populations start living and reproducing differently, so they evolve into two separate species, which is speciation (also known as divergent evolution). Reproductive isolation and speciation reduces gene flow.
How does speciation affect evolution?
Speciation is the process by which new biological species arise. It is part of the evolutionary process; how two or more populations of one species, when separated geographically, can gradually change over time in different ways, to become separate species.
What is the main factor that leads to speciation between two populations?
Lack of exchange of genetic information.
Two populations that are sperated by a mountain range can no longer interbreed to produce fertile offspring this is an example of?
This is an example of geographic isolation, where a physical barrier like a mountain range separates populations, preventing gene flow and leading to reproductive isolation. Over time, this can result in the populations evolving independently and potentially becoming distinct species.
How does roproductive isolation relate to evolution?
If two sub-populations of a species become reproductively isolated, it means that adaptation or genetic drift can make the two populations diverge genetically. If, as a result of this divergence, upon reintroduction, members of the two sub-populations no longer reproduce successfully, the two sub-populations have become different species.
