biodiversity by: adrian gomez. types of diversity genetic diversity-involves the range of all...
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Natural Selection How organisms evolve Shows what organism has adapted, survived, reproduced, and pass it on to off springs in new environment Without a change in environment, evolution nor natural selection would occurTRANSCRIPT
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Biodiversity By: Adrian Gomez
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Types of Diversity
• Genetic diversity-involves the range of all genetic traits, both expressed and recessive
• Species diversity- # of different species that inhabit a specific area
• Ecosystem diversity- range of habitats that can be found in defined area composed of both biotic and abiotic components
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Natural Selection
• How organisms evolve • Shows what organism has adapted, survived, reproduced,
and pass it on to off springs in new environment• Without a change in environment, evolution nor natural
selection would occur
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Stabilizing Selection
• Affects the extreme of the population
• Most common from of natural selection
• Individuals that deviate too far from normal conditions are removed
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Directional Selection
• Affects the extreme of the population
• Do very well in future generations
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Disruptive Selection• Acts against individuals
that have the avg condition
• Favor individuals at the extreme ends
• Population is almost split in two
• Evolution occurs
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Evolution• Change in the genetic
composition of a population during successive generations as a result of natural selection acting on yhe genetic variations among individuals and resulting in the development of new species
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Speciation
• When segments of a population of one species become so isolated that gene flow stops
• 3 types of adaptive radiation:• General radiation-species develop new abilities to reach new parts of
the environment• Environmental change-species that can survive in radically changed
environment and branch into new species• Geographic isolation-isolated ecosystems can be colonized by a species
that undergoes rapid evolution
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Convergent Evolution
• Process whereby organisms not closely related to each other independently acquire characteristics while evolving in separate and sometimes varying ecosystems
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Parallel Evolution
• When 2 species evolve together at the same time and in the same ecosystem and acquire similar characteristics
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Ecological Succession
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Extras
2 links• http://plato.stanford.edu/e
ntries/biodiversity/
• http://www.nwf.org/Wildlife/Wildlife-Conservation/Biodiversity.aspx
Video link• http://youtu.be/3JeYaFGYOSM