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24 Cards in this Set
- Front
- Back
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What are the 5 requirements of the Hardy-Weinberg theorem?
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-Mating is Random
-Population is large -no migration between populations -no mutation -Natural selection doesn't affect the amount of alleles being expressed |
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Taxon
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a group of organisms
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Sister Taxa
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two groups united by the presence of a synapomorphy
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Derived Trait
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A trait that was different from what was present in the ancestor
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Monophyletic group
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group that contains ALL the common descendants of a common ancestor
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Paraphyletic group
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some descendants, but not all
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Polyphyletic group
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Groups that contain taxa that do not share a most common recent ancestor
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aphmorphy
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derived characteristics
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synapomorphy
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shared, derived character
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homoplasy/convergent evolution
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similarity sue to independent evolution
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When was the largest mass extinction?
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Permian
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When was the largest radiation?
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Triassic
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Sexual selection involves
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competition and sexual dimorphism
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Agents of Selection
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factors that help selection occur. predators, etc
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What are the 2 types of competition? Explain
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intraspecific-among members of own species
interspecific-leads to competitive exclusion |
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What is necessary for Darwin's view of natural selection?
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-There must be more individuals than resources can support
-There must be genetic variability that makes one organism have more fitness. -there muse be a way to pass down traits form one generation to the next |
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Natural Selection
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Differential to survival and reproduction. It is a phenomenon of the population
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Inclusive fitness
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genetic relationships might explain altruism
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Allopatric population
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when there is no gene flow between species
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kings play chess on fat green stools
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kingdom, phylum, class, order, family, genus, species
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Sympatric speciation
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new species form within the range of an ancestral species
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For a population to evolve, its members must
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possess heritable variation.
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To establish that evolution by natural selection is operating in a population, one must demonstrate variability for a trait, heritability of that trait, differential reproductive success based on that trait, and:
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nothing else.
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A population is said to be polymorphic for a locus if it has at least
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two different alleles at that locus.
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