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Explain how geographic isolation can lead to allopatric speciation?
Wiki User
∙ 12y ago
Imagine one species that has become isolated from each other for some reason, perhaps an earthquake. The place one finds itself in is a grassland and the second one is in a deep valley that is a rain forest.
The two groups can not connect at all. Because the grassland has fewer resources than the rainforest, the number found in the grass land will be fewer.
The rainforest has more rainfall and those there have to adapt to that. Perhaps they will be preyed upon and the members that have better coloring so that they can hid, will be come in greater numbers.
For now, the colors of the two groups will be different. As time goes on, other small changes will occur that will allow the groups to do well in their environment.
After many, many, many, years, the two maybe so different, that they can't interbred if they could.
Now there will be two species.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agoGeographic isolation, as the name implies, separates individuals from each other. In effect it divides the gene pool into two new gene pools. Individuals separated from each other are physically kept from breeding and therefore from blending the large gene pool. Over time, certain genes are reduced in number within each of the two new populations because those genes do not convey any particular advantage to the individuals.
This separation may be by formation of an island, rising up of a mountain range, or, in the case of the Florida Panther, the building of interstate highways.
As mutations occur within the separate populations and a change in the make up of the gene pool as some genes become more prevalent and some less so in one of the new populations, certain other changes occur in the genetic make up of the two individual populations. These changes could be in the way mates are chosen, timing of mating, or even gross chromosomal changes.
Whatever the reason, these two populations change sufficiently to prevent interbreeding. If they are recombined, individuals from the two populations will not breed or if they do they will not produce viable offspring. This is the defining characteristic of different species--the inability to produce viable offspring.
Wiki User
∙ 12y agoGeographic isolation may lead to environmental differences, thus leading to an organisms different needs. These slight changes in environment and needs gradually change the organism leading to a different species. This process is called adaptation.
Wiki User
∙ 9y agoImagine one species that has become isolated from each other for some reason, perhaps an earthquake. The place one finds itself in is a grassland and the second one is in a deep valley that is a rain forest.
The two groups can not connect at all. Because the grassland has fewer resources than the rainforest, the number found in the grass land will be fewer.
The rainforest has more rainfall and those there have to adapt to that. Perhaps they will be preyed upon and the members that have better coloring so that they can hid, will be come in greater numbers.
For now, the colors of the two groups will be different. As time goes on, other small changes will occur that will allow the groups to do well in their environment.
After many, many, many, years, the two maybe so different, that they can't interbred if they could.
Now there will be two species.
Wiki User
∙ 7y agoWiki User
∙ 6y agoselective pressure causes genetic drifting
Wiki User
∙ 10y agosub species
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How did Dobzhansky and Mayr explain the origin of species?
In the 1930s, Dobzhansky and Mayr explained that species originate through allopatric speciation.
Explain how isolation helps speciation?
Reproductive isolation prevents variations from spreading throughout the entire population. Since genetic variations basically occur randomly, the chances that the same variations will occur in both reproductively separated subpopulations are vanishingly slim. Thus, genetic divergence between both subpopulations will occur, and this may eventually lead to speciation. Isolation stops populations of the same species from interbreeding. This results in separate breeding among populations and genetic differences become more pronounced with each generation.
How does Darwin's theory of evolution explain microevolution but not macroevolution?
Those terms need to be done away with. There is no such division in the theory of evolution by natural selection, even in Darwin's time. There is evolution and speciation. One flows seamlessly into the other over time and we have myriad pieces of evidence supporting this.
Explain the producer's equilibrium?
Explain the producer's equilibrium?
Define and explain sugar fermentation?
Define and explain sugar fermentation.
How did Dobzhansky and Mayr explain the origin of species?
In the 1930s, Dobzhansky and Mayr explained that species originate through allopatric speciation.
Explain how geographic isolation can lead to speciation?
Geographic isolation may lead to environmental differences, thus leading to an organisms different needs. These slight changes in environment and needs gradually change the organism leading to a different species. This process is called adaptation.
Continental drift help to explain geographic isolation as a component in speciation?
the continent moved creating a new environment because of water and air temperature. Therefor species had to change.
How did dobzhansky and mayr explain the origin of species in the 1930's?
In the 1930s, Dobzhansky and Mayr explained that species originate through allopatric speciation.
How would you assess the bio-geographic evidence used to explain the divergence of Hawaiian honey-creeper species?
Geographical Isolation
Explain how isolation helps speciation?
Reproductive isolation prevents variations from spreading throughout the entire population. Since genetic variations basically occur randomly, the chances that the same variations will occur in both reproductively separated subpopulations are vanishingly slim. Thus, genetic divergence between both subpopulations will occur, and this may eventually lead to speciation. Isolation stops populations of the same species from interbreeding. This results in separate breeding among populations and genetic differences become more pronounced with each generation.
What does the reading stradegy ASICE stand for?
A- assertion S- support I- isolation C- connect E- explain
Explain the evidence of evolution presented by the mammals of Australia?
the mammals of Australia evolved in isolation on the Australian continent
What is punctuated evolution?
Punctuated Equilibria is a theory proposed by Stephen Jay Gould and Niles Eldredge to explain patterns of speciation in the fossil record. They pointed out that the record seems to show most species undergo long periods of relatively little change (stasis), then undergo rapid bursts of change at irregular (punctuated) intervals. Evolution did not seem to proceed at a stately, constant, slow speed. Gould and Eldredge explained this by taking the standard idea of how species form (allopatric speciation, or speciation in small isolated groups at the periphery of populations) and showing that this process would produce exactly the pattern which is observed in the fossil record. Essentially, evolution and speciation can occur rapidly in small isolated populations, sometimes too quickly for the fossil record to track all of the intermediate forms. The result is what looks like abrupt emergence of forms with little or no transitional stages, when in reality the evolution had occurred through intermediate stages, only too quickly for the slow process of fossilization to capture it.
Charles Darwin's thoughts on evolution would correspond to punctuated equilibrium?
Punctuated Equilibria is a theory proposed by Stephen Jay Gould and Niles Eldredge to explain patterns of speciation in the fossil record. They pointed out that the record seems to show most species undergo long periods of relatively little change (stasis), then undergo rapid bursts of change at irregular (punctuated) intervals. Evolution did not seem to proceed at a stately, constant, slow speed. Gould and Eldredge explained this by taking the standard idea of how species form (allopatric speciation, or speciation in small isolated groups at the periphery of populations) and showing that this process would produce exactly the pattern which is observed in the fossil record. Essentially, evolution and speciation can occur rapidly in small isolated populations, sometimes too quickly for the fossil record to track all of the intermediate forms. The result is what looks like abrupt emergence of forms with little or no transitional stages, when in reality the evolution had occurred through intermediate stages, only too quickly for the slow process of fossilization to capture it.
Explain the geographic uniqueness of the galapagos islands?
The geographic uniqueness of the Galapagos islands is the fact that it is a archipelago of volcanic origins. These islands hold many endemic species no longer, or never seen elsewhere.
How does natural selection explain specialization?
It doesn't per se. Speciation occurs usually when two gene pools are isolated long enough by geography or by separate selective pressures that one group becomes able to reproduce with the other with difficulty, and eventually not at all. Horses can mate with zebras and a few other animals for instance, but produce sterile offspring. Speciation has been observed in nature many times, and forced to occur in the laboratory. Google "instances of speciation" for examples.
