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Ch. 17
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Term | Definition |
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Adaptive Radiation | When one lineage rapidly diversifies into several new species |
Evolutionary Tree | A diagram that shows which physical traits are shared in one species to another |
Founder Effect | When a group of species within a population decide to make their own population |
Genetic Equillibrium | When the allele frequency for a trait doesn't change in a gene pool |
Microevolution | When the allele frequency for a trait does change in a gene pool |
Phylogeny | The evolutionary history of a species |
Allele Frequency | The amount of an allele that a population has |
Bottleneck | A great reduction in population size |
Cladogram | A branching diagram that tells how different species are related |
Coevolution | When the evolution of one species affects the evolution of another |
Derived Trait | A Character present in a group under consideration , but not in any of the group's ancestors |
Exaptation | When a species adapts for a whole different reason |
Extinct | A species that has died away because it couldn't adapt to its environment |
Gene Flow | The movement of alleles between populations |
Gene Pool | All of the Alleles of genes within a population |
Genetic Drift | Change of an allele's frequency over time |
Inbreeding | Breeding between close relatives |
Lethal Mutation | A mutation that changes phenotype to a point that leads to death |
Macroevolution | Evolution on a larger scale |
Population | A large group of a species that live in a certain area that breed with each other |
Reproductive Isolation | The end of gene flow between populations |
Sexual Selection | A form of natural selection where the species with the best traits are chosen to reproduce with |
Speciation | A process in which new species arise through isolation from a larger population |
Stasis | When a lineage that has persisted for million of years has had very little evolutionary pattern |