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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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