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21 Cards in this Set

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  • Back
Population
all the individuals of a species that live together in one place at a time
Population size
the number of indivuduals in a population
population density
the number of indivudials that live in a given area
disperation
the way the individuals of the population are arranged in space
three types of dispersion
random, even, and clumped
population model
a hypothetical population that attempts to exhibit the key characteristics of a real population
exponential growth curve
is a curve in which the rate of population grown stays the same, as a result the population size increases steadily
density-dependent factors
limited resources amount of water, food
carrying capaity
the population size an environment cans sustain
logistic model
a population model in which exponential grown is limited by density dependent factors
r-strategists
species that adapt and grow rapidly in changing environment, bacteria, mosquitos, cockroaches
K-strategists
Organsims that grow slowly and have small populations sizes such as whales
density imdependent factors
growth of speies limited by environmental conditions
ex. weather and climate
Ex mosquitos pop. increase in summer due to warm weather, decrease during winter
Hardy-
weinberg principle
frequencies of alleles in a population do not change unless evolutionary foreces act on the population
gene flow
the movement of alleles into or out of a population
nonrandom mating
mating with others that live nearby or of same phenotype
(mating with relatives, inbreeding
genetic drift
change in an allel's frequency (occurs in small populations/changed by chance event fire, landslide
Cheetas
polygenic
a trait that is influenced by several genes( human height/skin color
normal distribution
hill shaped curve on graph
alleles average value
directional selection
the frequency of a particular trait moves in one direction in a range.(like pestsicide resistance in insects change of the average value of a population
stabilizing selection
distribution becomes narrower
Increases of the number of average individuals