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Evolution Chapter
name | definition |
---|---|
Evolution | gradual change in species over time (many generations) |
mutation | permanent change in the DNA |
genetic variation | individuals in a population vary from each other. Variations (adaptations) occur randomly by mutations or by reshuffling of alleles during meiosis |
adaptations | traits(physical or behavioral) that help an organism to survive and reproduce in a particular environment |
Natural selection | a process by which individuals which are better adapted to their environment are more likely to survive and reproduce than other members of the same species. |
survival of the fittest | a better adapted organism is able to reproduce and pass on its “fittest” genes to its offspring |
fossil | remains of life from another time period that are buried in the earth |
fossil record | timeline of life found in the layers of the Earth’s crust |
extinction | results when a species does not have traits to survive & so completely dies out. |