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Evolution
| Term | Definition |
|---|---|
| Darwin | a naturalist who contributed to the theory of evolution, he said that all species decended from a commen ancestor and that all species evolve, not individuals |
| Mimicry | the ability to look like another species, genreally used to avoid being eaten |
| Camouflage | the ability to blend in with ones surounddings |
| Directional selection | pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype |
| Speciation | evolution of two or more species from one ancestral species |
| Divergent evolution | evolution of one or more closely related species into different species; resultion from adaptations to different enviornmental conditions |
| Species | a group of organisims so similar to one another that they can breed and produce fertile offspring |
| Natural selection | mechanism by which individuals that have inherited beneficial adaptations produce more offspring than others |
| Structural adaptation | special adaptations that help an organism better survive in its enviorment |
| Vestigial structure | remnants of an organ or structure that functioned in an earlier ancestor |
| Stabilizing selection | a type of natural selection where genetic diversity DECREASES and the population mean stabilizes on a particular trait value |
| reproductive isolation | the final stage in specitaion, iin which members of isolated populations are either or no longer able to reproduce viable offspring |
| Adaptive radiation | the process by which one species evolves and gives rise to many decendent species that occupy different ecological niches |
| Kingdom | a taxonomic rank that is composed of smaller groups called phyla (or divisions for the plants) |
| Homologous structure | body part that is similar in structure in different organisms but preforms the same function |
| Radiometric dating | techniquie that uses the natural decay rate of isotopes to calculate the age of material |
| Disruptive selection | pathway of natural selection in which two opposite, but equally uncommon, phenotypes are selected over the most common phenotype |
| Geographic isolation | isolation between populations due to physical barriers |
| Convergent evolution | the evolution towards similar characteristics in unrelated species,resulting fromadaptations to similar enviornmental conditions |
| Adaptation | inherited trait that is selected for over time because it alows an organism to better survive in their enviornment |
| Microevolution | observable change in an allele frequencies of a population over a few generations |
| Evolution | the change in a species over time; process of biological change by which descendents come to differ from their ancestors |
| Macroevolution | evolved enough to become a population |
Created by:
18verheb
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