1.4 Microevolution and macroevolution
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.
... 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 ...
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 ....
... 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.
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 ...
... 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 .
... 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 .
... 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 ...
... 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 ...
... 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 ...
... Because microevolution can be observed directly, both pro-evolution and some anti-evolution groups agree that it is a fact of life.
, Molecular evolution , 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 ...