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Beschreibung
Mindmap von harry_bygraves, aktualisiert more than 1 year ago
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Erstellt von harry_bygraves
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Speciation
- Speciation; the process by which two or more species evolve from one orginal species
- Species; a group of organisms sharing similar features which a
reprdouctively isolated from other species and which can interbred
to produce fertile offspring
- Organisms that do not interbred to produce fertile
offspring under normal circumstances are regarded as
reproductively isolated, and they belong to a seperate
species
- Reproductive isolation; becoming unable to interbred. Rarely to all
memebers of a species exist in a single large population. they usually live in
a number of local interbreeding populations called demes. If rproductive
isolation occurs between demes the demes may over a long period of time
evolve by natural selection into a new species
- Mechanisms that prevent breeding between
popualtions and which can eventually lead to
speciation are called isolating mechanisms. The most
important is thought to be geografical isolation, in
which two popluations orginally of the same species
are seperated from each other by a physical barrier
e.g. ocean
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