change in a species overtime; process of biological change by which descendents come to differ from their ancestors.
Prposed to be explanation for a wide variety of observations and experiemental results.
trace of an organism from the past.
Process by which humans modify a species by breeding it for certain traits.
measure of an organism's ability to survive and produce offspring relative to other members of a population.
inherited trait that is selected for overtime because it allows organisms to better survive in their environment.
by which individuals that have inherited beneficial adaptations produce more offspring on average than do others individuals.
body part that is similar instructure on different organisms but performs different functions.
remnants of an organ or structure that functioned in a earlier ancestor.
estimate of the age of a fossil based on the location of fossils in strata.
collection of alleles found in all of the individuals of a population.
trait that is produced by two or more genes.
pathway of natural selection in which one uncommon phenotypes selected over a more common phenotype.
pathway of natural are selected over phenotypes at both extremes.
pathway of natural selection in which two opposite, but equally uncommon, phenotypes are selected oven the most common phenotype.
change in allele frequencies due to chance alone,occuring most commonly in small populations.
condition in which a population allele frequencies for a given trait do not change from generation to generation.
evolution of two or more species from one ancestral species.
final stage in speciation which members of isolated populations are either no longer able to mate or nothing able to produce viable offsprings.
isolation between population due to