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Chapter 23: Species and their Formation (Part I & II)

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University of Toronto Scarborough
Biological Sciences
Kamini Persaud

Chapter 23: Species and their Formation Mar 102011 What are Species? Speciation: the process by which one species splits into two or more daughter species Occurs gradually, and through a time line, you can tell where the distinction happens Species = kinds o 1. Morphological Species Concept: Recognize species by their appearance (Darwin did this) Share alleles Binomial system of nomenclature (genus names ex: homosapiens) Did not recognize offspring differences and malefemale differences o 2. Biological Species Concept: Species are groups of actually and potentially interbreeding natural populations which are reproductively isolated from other such groups Individuals in a population can mate with each other but not with those of another population They are distinct evolutionary unit within which genes recombine How do new species arise? Species sometimes change by adapting to the changes in their environment If a species become isolated into 2 populations, within each isolated gene pool, allele and genotype frequencies change and result of evolutionary mechanisms They no longer can interbreed once the barrier is removed HOW?
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