A trait that initially carries out one function and is later co-opted for a new function. The original function may or may not be retained: homoplasy paraphyletic exadaptation synapomorphy polytomy
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Step 1: Exaptation is the process by which a trait that evolved for one function is later co-opted for a different function. Show more…
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A trait that performs a function in a current environment but that did not evolve as a result of natural selection for that function is an example of a(n): Homologous trait Exaptation Vestigial trait Adaptive trait Transitional trait
Sri K.
An exaptation is a pre-existing trait used for a new, seemingly adaptive function. The term was coined by Stephen Jay Gould and Elisabeth Vrba, to improve clarity of language when discussing the co-opting of a trait for a new function-and to distinguish this from "preadaptation," as used by George Gaylord simpson, referring to a structure that undergoes a change of function followed by tinkering by natural selection. Both terms are used by biologists, with subtly different meanings. Find some examples of pre-existing traits being used by organisms for a new function and discuss whether exaptation or preadaptation would be an appropriate label. Many criticisms exist for both terms. Find some examples of these criticisms and discuss whether they apply to your examples.
Adi S.
The definition of Exaptation is as follows: a trait, feature, or structure of an organism or taxonomic group that takes on a function when none previously existed or that differs from its original function which had been derived by evolution. Throughout the chordate evolution, there are several instances of this occurring. (a) Describe three examples of chordate exaptations, (b) explain how natural selection promoted them to occur and (c) describe the evolutionary consequence (or outcome) in the lineages where they evolved
Madhur L.
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