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Speciation in Biological Definition

Evolution

... 1.4 Microevolution and macroevolution 1.5 speciation and extinction 2 Evolutionary biology ... usually taken to refer to events that result in speciation , the evolution of a new species . An absolute ... in two populations of organisms so different that speciation can be said to have occurred. ...

Punctuated equilibrium

... of evolution which states that changes such as speciation can occur relatively quickly, with long periods ... heavily on Ernst Mayr's concept of peripatric speciation , and has been summarized by Gould as follows: ... fossil record include if most evolution occurs by speciation in peripheral isolates? ... In any local area ...

Speciation

... speciation refers to the appearance of a new species of ... . Most of these ideas share the hypothesis that speciation occurs when a parent species (also referred to as ... changes (called "saltation") that result in speciation in a very short ....

Extinction

... now extinct. In the theory of evolution , new species are created by speciation — where new organisms arise and thrive when they are able to find ... more frequent. The founder effect can cause rapid, individual-based speciation and is the most dramatic example of a population bottleneck. Habitat ...

Modern evolutionary synthesis

... as a result of genetic drift , gene flow and natural selection . speciation occurs gradually when populations are reproductively isolated by ... analyses of phenomena such as kin selection , altruism , and speciation . A particular interpretation of neo-Darwinism most commonly ...

Species

... and immutable. The rise of a new species from a parental line is called speciation . There is no clear line demarcating the ancestral species from the ... such as "kingdom" and " genus ". See also: race . See also speciation External links ...

Adaptive radiation

... Adaptive radiation describes the rapid speciation of a single or a few species to fill many ecological niches . This is an evolutionary process driven by mutation and natural selection . ...

Gene duplication

... This is opposed to orthologous genes that code for proteins with similar function but that exists in different species. Orthologs are created from a speciation event. (See Homology of sequences in genetics ) It is important (but often hard) to differentiate between paralogs and orthologs in biological ...

Genetics

... natural selection , genetic drift , mutation and migration . It is the theory that attempts to explain such phenomena as adaptation and speciation . The related subfield of quantitative genetics, which builds on population genetics, aims to predict the response to selection given data on the ...

Lynn Margulis

... On the Evolution of Human Sexuality , Summit Books, ISBN 0671633414 Margulis, Lynn, ed, 1991, Symbiosis as a Source of Evolutionary Innovation: speciation and Morphogenesis , The MIT Press, ISBN 0262132699 Margulis, Lynn, 1992, Symbiosis in Cell Evolution: Microbial Communities in the Archean and ...

Microevolution

... Because microevolution can be observed directly, both pro-evolution and some anti-evolution groups agree that it is a fact of life. See also speciation , Molecular evolution , Population genetics ...

Population genetics

... of population subdivision and population structure in space. As such, it is the theory that attempts to explain such phenomena as adaptation and speciation . Population genetics was a vital ingredient in the modern evolutionary synthesis , its primary founders were Sewall Wright , J. B. S. Haldane ...
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