Speciation - The evolution of a new species from an existing one., Reproductively separated - Where invidiuals are separate due to a number of reasons which means they cannot reproduce to make new offspring., Adaptive radiation - Where a population becomes adapted to it's local environment, Genetic drift - The mechanism of evolution in which allele frequencies of a population change over generations due to chance, the impact is seen more in smaller populations, Allopatric speciation - The formation of a new species due to organisms being geographically isolated., Sympatric speciation - The development of a new species from organisms that live in the same habitat but are reproductively isolate., Geographically separated - Where populations are separated due to geographical barriers such as rivers, oceans and mountain ranges., Temporal isolation - The isolation of organisms due to breeding seasons not coincide., Behavioural Isolation - Where the courtship rituals of individuals are not compatible with individuals of the opposite sex,, Gametic isolation - Where the gametes of individuals are prevented from meeting due to genetic or biochemical incompatibility., Hybrid sterility - When differen species breed together often their offspring cannot produce viable gametes.,

A Level Biology- Chapter 18- 18.5

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