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28 Cards in this Set
- Front
- Back
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Gene Flow
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Transport of genes into a population by migrating individuals.
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Fossil Record
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Physical evidence of past organisms changing through time, left in rocks.
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Evolution
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Change through time.
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Divergent Evolution
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Species that were once similar to ancestral species change in different ways as they adapt, creating new species.
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Directional Selection
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Favors ONE of the extremes in a population (AA or aa) lead to rapid evolution.
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Disruptive Selection
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Favors both extremes in a population (AA, and aa), eliminates the averages (Aa).
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Convergent Evolution
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Evolution that distinctly related organisms evolve similar traits when they live in similar environments.
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Allelic Frequency
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The percentage of any specific allele occurring in a population.
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Analogous Structure
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Structures that are similar in function but no common origin.
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Behavioral Isolation
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Populations can no longer interbreed due to difference in mating behaviors (a form of reproductive isolation).
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Vestigial Structure
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Structure in present day organism that's not useful but was useful in an ancestor.
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Embryo
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An organism in the early stages of development.
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Adaptation
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Organism can respond and change with its environment.
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Adaptive Radiation
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Single ancestral species evolves into a wide array of species to fit different habitats.
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Gene Pool
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All the alleles which are possible in population's genes that could be passed on.
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Genetic Drift
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Change in alleles frequency cause by some event, changes genetic equilibrium.
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Genetic Equilibrium
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The frequency of alleles in a population remains the same over many generations.
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Geographic Isolation
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Physical barrier divides a population, resulting in creating populations which evolve separately and cannot interbreed.
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Gradualism
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Species originate through a gradual change of adaptations.
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Stabilizing Selection
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Favors the AVERAGE population (Aa) resulting in less variation.
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Speciation
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Evolution of new species from one common ancestor that results in multiple new species whom cannot interbreed.
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Reproductive Isolation
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Populations can no longer interbreed due to differences in genetic material.
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Punctuated Equilibrium
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Species can occur relatively with period of genetic equilibrium between them.
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Natural Selection
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Mechanism for change in a population for individuals to survive.
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Homologous Structure
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Structure with similar functions and arrangement with common origin.
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Charles Darwin
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Discovered the theory of evolution by natural selection.
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Camouflage
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An adaptation that enables species to blend with their surroundings.
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Mimicry
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A structural adaptation that enables one species to resemble another species.
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