When a species or group of species move to a new area or habitat.
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Genetic drift
The change in the frequency of an existing gene variant in a population due to random chance.
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Stabilizing selection
Average form of a trait is the most desirable.
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Population
A group of the same species within an area.
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Allopatric speciation
When a species population is separated by a geographical barrier, creating a new species due to different environments.
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Sympatric speciation
The evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region.
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Coevolution
Two species that have evolved in response to each other.
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Theory of evolution
The idea that species change with modification over long periods of time.
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Adaptation
A trait that is beneficial to the species long term survival.
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Mutation
When an organism develops a different genetic feature than their parents.
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Variation
The random difference between generations of cells or organisms
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Environment
The conditions in which a person or animal lives.
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Vestigial Structures
Body parts that seem to no longer have a purpose in an organism.
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Genes
The unit of heredity.
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Microevolution
Changes in species at a molecular or gene level.
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Habitat
Area in which an organism lives
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Process of selective breeding
Organisms with desirable characteristics are selected and made to breed
The offspring are observed for signs of those desirable traits.
The best ones are made to breed to create more offspring with those traits.
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Chromosome
A double stranded DNA molecule that contains a series of specific genes along its length.
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Fossil
A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded, and preserved in the Earth's crust, usually in stratified rock.
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Common Ancestor
An ancestor shared by at least species different from the ancestor.
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Variation
How much difference there is between individuals in a population.
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Competition
The fighting for resources between species or inside a species.
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Postzygotic Isolation
Reproductive isolation that occurs after members of two different species have mated and produced a hybrid offspring.
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Intersexual Selection
Selection whereby individuals of one sex choose their mates from individuals of the other sex.
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Intrasexual Selection
A direct competition among individuals of one sex for mates of the opposite sex.
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Evolutionary trees
The connection(s) between different species that branch from the earliest common ancestor.
Studied by 13 people
