| A | B |
|---|
| carrying capacity (16-1) | the population that an environment can sustain |
| density dependent factor (16-1) | resources that are limited and get used up as populations grow |
| density independent factor (16-1) | environmental conditions that are unaffected by the density of populations which that limit the growth of many species of plants & insects that reproduce rapidly |
| directional selection (16-2) | type of natural selection that causes the frequency of a particular allele to move in one direction |
| dispersion (16-1) | the way individuals of the population are arranged in space or the pattern of distribution |
| exponential growth curve (16-1) | a J-shape curve showing the rapid increase in an exponentially growing population |
| gene flow (16-2) | the movement of alleles into or out of a population |
| genetic drift (16-2) | random change in allele frequency in a population |
| Hardy-Weinberg principle (16-2) | frequencies of alleles in a population do not change unless evolutionary forces act on the population |
| k-strategist (16-1) | species characterized by slow maturation, long life span, few young, slow population growth, reproduction late in life, and extensive parental care with slow-growing populations with density usually near the carrying capacity of their environment |
| logistic model (16-1) | a population growth model in which exponential growth is limited by a density-dependent factor and assumes finite resources levels limit population growth |
| nonrandom mating (16-2) | a population growth model in which exponential growth is limited by a density-dependent factor and assumes finite resources levels limit population growth |
| normal distribution (16-2) | a bell-shape curve that results when the values of a trait in a population are plotted against their frequency |
| polygenic trait (16-2) | trait that is influenced by several genes and tend to exhibit a range of phenotypes |
| population (16-1) | all the individuals of a species that live together in one place at one time & breed with others in the group |
| population density (16-1) | the number of individuals that live in a given area |
| population model (16-1) | a hypothetical population that exhibits key characteristics of a real population |
| population size (16-1) | the number of individuals in a population |
| r-strategist (16-1) | species characterized by rapid growth, high fertility, short lifespan, & exponential population growth with small offspring that mature rapidly, and receive little or no parental care |
| stabilizing selection (16-2) | type of natural selection in which the average form of the trait is favored and becomes more common |
