Selected for SurvivalSelected for Survival

Get busy livin’ or get busy dyin’

(Andy-Shawshank Redemption)

Get busy livin’ or get busy dyin’

(Andy-Shawshank Redemption)

Natural Selection Versus Artificial Selection

Natural Selection Versus Artificial Selection

Artificial Selection: Changing characteristics of organisms by artificial means to attain certain characteristics

Artificial Selection: Changing characteristics of organisms by artificial means to attain certain characteristics

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Natural Selection Versus Artificial Selection

Natural Selection Versus Artificial Selection

Natural selection: A process by which organisms develop characteristics which are beneficial to their survival given biotic and abiotic factors of their environment

Natural selection: A process by which organisms develop characteristics which are beneficial to their survival given biotic and abiotic factors of their environment

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Survival of the fittestSurvival of the fittest

That organism which has traits which better suit it to survive the current conditions is more “Fit” than other organisms…so it survives

That organism which has traits which better suit it to survive the current conditions is more “Fit” than other organisms…so it survives

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FitnessFitness

Overall health and ability of a population and organisms ability to perpetuate its species. Its traits allow it to out compete other community and population members for food, water, shelter, space

Overall health and ability of a population and organisms ability to perpetuate its species. Its traits allow it to out compete other community and population members for food, water, shelter, space

NichesNiches

A species will have the best chance of survival if it occupies an empty niche.

A species will have the best chance of survival if it occupies an empty niche.

Adaptive RadiationAdaptive Radiation This process is illustrated by the

radiating of various species from one central species, due to biotic/abiotic factors. Occurs during reproductive isolation

This process is illustrated by the radiating of various species from one central species, due to biotic/abiotic factors. Occurs during reproductive isolation

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Divergent EvolutionDivergent Evolution Circumstances in environment

cause the gradual adaptation of a group of a population in response to differing biotic and abiotic factors. Also occurs during reproductive isolation

Circumstances in environment cause the gradual adaptation of a group of a population in response to differing biotic and abiotic factors. Also occurs during reproductive isolation

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Divergent Evolution…One more thing

Divergent Evolution…One more thing

Homologous structures: Structures formed on differing populations which are different in form and function due to biotic and abiotic factors but with same origin

Homologous structures: Structures formed on differing populations which are different in form and function due to biotic and abiotic factors but with same origin

Convergent EvolutionConvergent Evolution

Various species in a common environment develop similar traits as a response to the biotic and abiotic factors of the environment

Various species in a common environment develop similar traits as a response to the biotic and abiotic factors of the environment

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Convergent Evolution…One more thing

Convergent Evolution…One more thing

Analogous structures: Structures which form on different populations of organisms which are similar in form and function but with differring origins

Analogous structures: Structures which form on different populations of organisms which are similar in form and function but with differring origins

GradualismGradualism

The concept that evolutionary changes occur over long periods of time

Genes: Allows for randomness and similarity within populations

The concept that evolutionary changes occur over long periods of time

Genes: Allows for randomness and similarity within populations

Relative FrequencyRelative Frequency

Probability of an alleles presence in a population

Probability of an alleles presence in a population

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Genetic DriftGenetic Drift

Random change in the frequency of a gene

Random change in the frequency of a gene

EquilibriumEquilibrium

Relatively no change in populations adaptations over long stretches of time

Relatively no change in populations adaptations over long stretches of time

SpeciationSpeciation

Development of new species from existing ones due to evolution. Occurs during reproductive isolation

Development of new species from existing ones due to evolution. Occurs during reproductive isolation

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Reproductive IsolationReproductive Isolation

Caused by: Natural catastrophes (fire)

Environmental shift Geographical changes

Caused by: Natural catastrophes (fire)

Environmental shift Geographical changes

ExtinctionExtinction

The loss of species due to natural or artificial selection

The loss of species due to natural or artificial selection

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