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| Process by which organisms with certain inherited traits are more likely to survive and reproduce. |
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| A group of individuals of the same species living in the same place at the same time. |
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| A population's increase in the frequency of traits suited to the environment |
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| The change in genetic composition of the population over time. |
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| Imprints or remains of organisms that lived in the past. |
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| Presented the case for an ancient Earth sculpted by gradual geologic processes that continue today. Eventually applied toevolution |
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| Publication by Darwin giving evidence of evolution |
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| Ordered sequence of fossils as they appear in the rock layers |
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| Geographic distribution of species |
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| The comparison of body structures in different species |
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| Similarity in structure due to common ancestry |
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| Remnants of features that served important functions in the organism's ancestors. |
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| Means of representing how species evolve over time, usually in steps. |
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| The period when Mendelism and Darwinism combined |
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| Total collection of alleles in a population at any one time. |
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| Hardy-Weinberg Equilibrium |
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Definition
| When a gene pool in a population stays constant. |
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Definition
| A change in the gene pool of a population due to chance. |
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| Drastic reduction in population size. |
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| Shifts the overall makeup of a population by selecting in favor of one extreme phenotype. |
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Definition
| Contribution an individual makes to the gene pool of the next generation. |
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Definition
| Can lead to a balance between two or more contrasting phenotypes |
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Definition
| Favors intermediate phenotypes (reduction in variability) |
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| Form of natural selection in which Individuals with certain traits are more likely than others to find mates. |
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| Genetic Diversity due to the size of heritable traits, such as size of antlers. |
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| The major changes in the history of life, which are usually evident in the fossil record. |
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Definition
| Occurs when one species evolves into two or more species |
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| Defines a species as a group of populations whose members have the potential to interbreed and produce fertile offspring. |
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| Barriers in the place of animals due to factors in the environment / nature itself. |
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| Barriers that result if mating occurs between two species. |
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Definition
| Initial block to gene flow is a geographic barrier that physically isolates the splinter population. |
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| The origin of a new species without geographic isolation. |
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| Long periods of little change |
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Definition
| The retention of traits from infancy into adulthood. |
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Definition
| Consistent sequence of geologic periods. |
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Definition
| Method to determine the age of rocks, using rates of decay within radioactive isotopes. |
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Definition
| Species from different evolutionary branches may have certain structures that are basically similar. |
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Definition
| Similarity due to convergence |
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| Scientific search for an ancestral species and all its descendants. |
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Definition
| An ancestral species and all its descendants. |
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