CHAPTER 14 The Origin of Species. The origin of new species is called speciation. What is a species?. Similarities between some species and variation within a species can make defining species difficult The biological species concept defines a species as
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The origin of new species is called speciation
1. Reproductive isolation can result in speciation
Prezygotic and postzygotic reproductive barriers prevent individuals of different species from interbreeding
~Geographic isolation occurs whenever a physical barrier divides a population
1. Gradualism:new species evolve by the gradual accumulation of changes brought about by natural selection
2. Punctuated Equilibrium(proposed by Niles Eldredge and Stephen J. Gouldin 1972)