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bio-med test 1
hard test w/alot of vocab
| Question | Answer |
|---|---|
| Species | a group of living organisms consistings of similar individuals capable of exchanged genes. |
| Adaption | trait that helps an organism survives and reproduce. |
| Natural selection | process by wich individuals that are better adapted to their enviorment are more likely to survive and reproduce. |
| Competition | offspring must compete for food and other rresources to survive. |
| Variations | difference between individuals of the same species. |
| Stabilizing selection | favors average individuals,reduces variation in population. |
| Directional selection | extreme variations of a trait,leadfs to rapid evolution of population. |
| Diruptive selection | favors both extreme variations of trait, results eventually no intermediate forms of the trait and leads to the evolution of two new species. |
| Geographic isolation | new species can form when a group of individuals remain seperated from the rest of its species long enough to evolve diffrently. |
| Continental drift theory | emphasizes that pangea breaking a part resulted in geographic,isolation wich lead to evolution of various species. |
| Divergent evolution | pattern of evolution in which species that once were similar to an ancestral species diverge or become increaingly different. |
| Convergent evolution | pattern of evolution. |
| Fossils | preserved remains or traces of an organism that lived in the past. |
| Relative dating | determines wich two fossils are older. |
| Absolute dating | allows scientist to determine the atual age of fossils. |
| Gradualism | evolution occurs slowly but steadily. |
| Punctuated equilibrium | species evolve during short periods of rapid change. |
| Geologic time scale | calandar of earths history based on the fossil records. |
| Homologous structures | similar structures that are related species have inherited from common ancestor. |
| Branching tree | diagram that shows how scientist think diff groups of orgnisms are related. |
| Cladograms | constructed using fossil record, homologous structures embryollogical similarities,and DNA sequencing. |
| Macroevolution | large scale evolutionary change such as the formation of new groups above the species level. |
| Microevolution | smaller scale changes within species when relative frequency of alleles in a population changes over a number of generations. |
| Gene pool | collective group of alleles of all the individuals in a population. |
Created by:
chivas15
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