ANTH notes 9-26-07 - ANTH 2000 Natural Selection...

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ANTH 2000 9/26/07 Natural Selection Explained --All species contain enormous amounts of variation -Or, each individual is unique and different in some ways from all other individuals -Variable traits are inherited from parent to offspring -This was demonstrated by animal and plant breeders using “artificial selection” -Reproductive potential of most species greatly exceeds the number of actual decedents -Rabbits can have several litters of a dozen or more each year -Resources are limited & predators are abundant, so that not all those who are born, survive for long reproduce ( Struggle for Existence) - Clearly most rabbits that are born never survive to adulthood and reproduce. -Individuals with traits that better prepare them for the “struggle for existence” will survive and reproduce at higher rates, thus passing on their adaptive traits at high rates to the next generation. -This leads to adaptation of the population and eventually to the “origin of species” -Natural Selection results in
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