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How is adaptive radiation and convergent evolution similar?
They both employ the same mechanism: adaptation. The difference is that in one case, subpopulations diverge to adapt to differing circumstances, and in the other, separate species adapt to similar circumstances.
Can microevolution lead to macroevoultion?
Given the opportunity for reproductive isolation between subpopulations to develop, macroevolution seems like an inevitable consequence of microevolution. Not only can speciation occur (and not only is it observed): it's hard to imagine how it could not occur.
What is the difference between divergence and speciation?
Divergent speciation refers to the rise of a new species when organisms that can interbreed and reproduce fertile offspring get separated. Separation can be due to geographical barriers like mountains and lakes.
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 branching mean?
In the context of population dynamics and evolution, 'branching' refers to the first stages of a speciation event. Two subpopulations of the same species may, for various reasons, become reproductively separated - meaning that their hybridisation frequency decreases. At this point, the genetic 'distance' between the two populations will start to increase; the populations will diverge genetically. This phenomenon, divergence, may also be called 'branching'.
What has the author John P McKearn written?
John P. McKearn has written: 'The developmental heterogeneity of B-lymphocyte subpopulations'
What is Speciation and when does it occur?
Speciation is the branching of an ancestral population into two or more populations with a greatly reduced or even flatlined interbreeding frequency.Speciation occurs when, for any reason, subpopulations of the same ancestral stock start diverging. One of the reasons for this to happen may be a geographical isolation of two subpopulations, like sometimes happens during migrations, floods.A good example of the principles involved in speciation is the ring species.
What is the significance of color in the diversification of cichlids in Lake Victoria?
Female choice for specific male color patterns could reproductively isolate subpopulations of cichlids.
What is necessary for the evolution of two species from subpopulations of a common ancestor?
Different environmental challenges. Each group will adapt to suit their respective environment and will eventually diverge completely.
What is the process of formation of a new species?
The process is called: speciation. Basically it's when two subpopulations become reproductively isolated from one another and diverge genetically, morphologically and behaviourally.
How is adaptive radiation and convergent evolution similar?
They both employ the same mechanism: adaptation. The difference is that in one case, subpopulations diverge to adapt to differing circumstances, and in the other, separate species adapt to similar circumstances.
How does the theory of evolution explain the existence of modern humans?
It explains that modern humans are the result of a long-going and ongoing process of reproductive variation and differential reproductive success, punctuated by divergence between subpopulations and subsequent speciation events.
Can microevolution lead to macroevoultion?
Given the opportunity for reproductive isolation between subpopulations to develop, macroevolution seems like an inevitable consequence of microevolution. Not only can speciation occur (and not only is it observed): it's hard to imagine how it could not occur.
Does convergent evolution result in speciation?
All evolution that results in increasing genetic divergence between subpopulations may result in speciation. That includes convergent evolution: convergence occurs at the phenotypical level, not at the genetic level.
How does Charles Darwin's theory of evolution explain the existence of modern people?
It explains that modern humans are the result of a long-going and ongoing process of reproductive variation and differential reproductive success, punctuated by divergence between subpopulations and subsequent speciation events.
What is the difference between divergence and speciation?
Divergent speciation refers to the rise of a new species when organisms that can interbreed and reproduce fertile offspring get separated. Separation can be due to geographical barriers like mountains and lakes.
What has the author Aimee Sue Reel written?
Aimee Sue Reel has written: 'Enumeration of lymphocyte subpopulations bearing erythrocyte and surface immunoglobulin markers in normal cats and cats naturally infected with feline leukemia virus' -- subject(s): Lymphocytes, Retroviruses
