Chapter 22 � The Origin of Species

Chapter 22 � The Origin of Species - Chapter 22 The...

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Chapter 22 – The Origin of Species 02/03/2008 19:25:00 Concept of species must account for: Distinctiveness of species that occur together at a single locality ( sympatric ) Connection that exists among different populations belonging to the same  species One explanation is that each species exchanges genetic material only with other  members of its species  Species are  Groups of actually/potentially breeding natural population which are  reproductively isolated from other such groups o Sometimes groups can breed that are part of different species, but  they are termed as such because they would not normally mate and  their genes are not going to enter the gene pool of the mating partner. o Barriers for successful reproduction are called  reproductive isolating  mechanisms  = they prevent genetic exhcnage between species Prezygotic Geographic isolation
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Chapter 22 � The Origin of Species - Chapter 22 The...

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