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Population Biology
More Population Biology
Evolutionary Forces
Ecology
More Ecology
100
-same species -same place -same time -can interbreed
What is a population?
100
-a resource that is in short suppply and can prevent a population from growing -Ex. food
What is a limiting factor?
100
- different varieties of a gene -Ex. red hair, brown hair, blonde hair
What is an allele?
100
-role of a species in an ecosystem -only one species can occupy at a time
What is a niche?
100
-type of symbiosis where one organism is helped and the other is not helped or harmed
What is commensalism?
200
-different species living together in a habitat
What is a community?
200
-even -random -clumping
What is dispersion?
200
-emigration or immigration -genes move in or out of a population
What is gene flow?
200
-the first species to live in a new habitat -usually small plants
What is a pioneer species?
200
-type of symbiosis where both organisms are helped
What is mutualism?
300
-S curve -population will have rapid growth and level off at carrying capacity
What is logistic growth?
300
-limits population growth -factors not associated with population size -Ex. hurricane, flood
What is a density independent factor?
300
- an trait or characteristic that is more beneficial for survival in the environment -beneficial genes are passed on
What is natural selection?
300
-type of relationship where two organisms interact on a close, long term basis.
What is symbiosis?
300
-non-living portion of an ecosystem -Ex. sun, water
What is abiotic?
400
-J Curve -Population increases steadily
What is exponential growth?
400
-limits population growth -factors associated with population size -Ex. Food, water, sunlight
What is a density dependent factor?
400
-mates are chosen based on location, appearance, or ability
What is nonrandom mating?
400
-the variety of organisms in an ecosystem
What is biodiversity?
400
--long life span -slow to mature -extensive parental care -Ex. Tiger, whale, humans
What is a k strategist?
500
-The population size that an environment can support
What is the carrying capacity?
500
-small in size -short life span -little parental care -Ex. Bacteria
What is an r strategist?
500
-random occurance eliminates some member of a population -by chance some genes are left behind and passed on
What is genetic drift?
500
-progression of life in an area that has had no previous life -Ex. receding glacier
What is primary succession?
500
-progression of life in an area that has had pervious life -Ex. Occurs after a fire
What is secondary succession?