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19 Cards in this Set

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  • Back
population
group of individuals that belong to the same species
population size
total number of individuals in a population
population density
the number of individuals in a given area
population model
hypothetical population that attempts to exhibit key characteristics of a real population
exponential growth curve
J shaped curve showing the rapid increase in a growing pop.
carrying capacity
pop. size that an environment can sustain
density-dependent factor
Limited recources whose rates of depletion depend on the density of the population
logistic model
model of population growth that assumes finite recources levels limit population growth
density-independent factor
factors that effect the growth of a population
r-strategist
species characteristized by rapid growth, high fertility, short lifespan, and exponential population growth
k-strategist
species characteristiized by slow maturation, few young, slow population growth, and reproduction late in life
Hardy weinberg principle
prinicple
gene flow
movement of alleles in or out of a population
nonrandom matin
mating of individuals of the same phenotype, or who live close to eachother
genetic drift
random change in allele frequency
polygenic trait
characteristic of an organism that is influenced by many traits
normal distribution
bell shaped curve that results when the values of a trait are plotted
directional selection
natural selection that causes the frequency of a particular allele to move in one direction
stabilizing selection
type of natural selection in which the average form of the trait is favored and becomes more common