Division Ave. High School Ms. Foglia AP Biology AP Biology 2007-2008 Evolution by Natural Selection AP Biology AP Biology Life has changed & changed the Earth Living creatures have changed Earth’s environment, making other life possible AP Biology In historical context Darwin did not originate the idea of evolution Geologic theories of Earth’s age & history cleared the path for evolutionary biologists …immeasurable time… (5) (5) Over long periods of time, and given a steady input of Over long periods of time, and given a steady input of new variation into a population, these processes lead to new variation into a population, these processes lead to the the emergence of new species emergence of new species Essence of Darwin’s ideas (1) (1) Variation Variation exists in natural populations exists in natural populations (2) (2) Many Many more offspring more offspring are born each season are born each season than can possibly survive to maturity than can possibly survive to maturity (3) (3) As a result, there is a As a result, there is a struggle for existence struggle for existence - - competition competition (4) (4) Characteristics beneficial Characteristics beneficial in the struggle in the struggle for existence will tend to become more for existence will tend to become more common in the population, changing the common in the population, changing the average characteristics of the population average characteristics of the population - - adaptations adaptations AP Biology Effects of Selection Driving changes in a population

Division Ave. High School Ms. Foglia AP Biology · Division Ave. High School Ms. Foglia AP Biology AP Biology 2007-2008 Evolution by Natural Selection AP Biology AP Biology Life has

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Division Ave. High School Ms. FogliaAP Biology

AP Biology 2007-2008

Evolutionby

Natural Selection

AP Biology

Life has changed & changed the Earth

Living creatures havechanged Earth’s environment,

making other life possible

AP Biology

In historical context Darwin did not originate the idea of evolution Geologic theories of Earth’s age & history cleared the

path for evolutionary biologists

…immeasurable time…

AP Biology

(5)(5) Over long periods of time, and given a steady input of Over long periods of time, and given a steady input ofnew variation into a population, these processes lead tonew variation into a population, these processes lead tothe the emergence of new speciesemergence of new species

Essence of Darwin’s ideas(1)(1) VariationVariation exists in natural populations exists in natural populations

(2)(2) Many Many more offspringmore offspring are born each season are born each seasonthan can possibly survive to maturitythan can possibly survive to maturity

(3)(3) As a result, there is a As a result, there is a struggle for existencestruggle for existence - - competitioncompetition

(4)(4) Characteristics beneficialCharacteristics beneficial in the struggle in the strugglefor existence will tend to become morefor existence will tend to become morecommon in the population, changing thecommon in the population, changing theaverage characteristics of the populationaverage characteristics of the population - - adaptationsadaptations

AP Biology

Effects of Selection Driving changes in a population