Point Quarter Sampling

Selected for Survival Get busy livin’ or get busy dyin’ (Andy-Shawshank Redemption)

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

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

Survival 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

Fitness
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

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

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

Divergent 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

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

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

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

Gradualism
The concept that evolutionary changes occur over long periods of time
Genes: Allows for randomness and similarity within populations

Relative Frequency
Probability of an alleles presence in a population

Genetic Drift
Random change in the frequency of a gene

Equilibrium
Relatively no change in populations adaptations over long stretches of time

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

Reproductive Isolation
Caused by:
Natural catastrophes (fire) Environmental shift
Geographical changes

Extinction
The loss of species due to natural or artificial selection

Point Quarter Sampling

by coachsteg

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