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Molecular evolution is the change in the sequence composition of cellular molecules such as DNA, RNA, and proteins across generations.

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largely discredited biological hypothesis that the development of the embryo of an animal

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This includes stuff like wisdom teeth, appendex, muscles in the ear, tail bone, and body hair.

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A homologous structure is an example of an organ or bone that appears in different animals, from ancestors.

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variation in the relative frequency of different genotypes in a small population, showing to the chance disappearance of particular genes.

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natural selection arising through preference by one sex for certain characteristics in individuals of the other sex.

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Divergent, Parallel and Convergent Evolutions

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Divergent, Parallel and Convergent Evolutions

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Factors such as environment and predation pressures can have different effects on the ways in which species exposed to them evolve. shows the three main types of evolution: divergent, convergent, and parallel evolution.

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The Cretaceous-Tertiary mass extinction is famed for the death of the dinosaurs. However, many other organisms perished at the end of the Cretaceous.

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During the final 18 million years of the Triassic period, there were two or three phases of extinction whose combined effects created the Triassic-Jurassic mass extinction event. Climate change, flood basalt eruptions and an asteroid impact have all been blamed for this loss of life.

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The Permian mass extinction has been nicknamed The Great Dying, since a 96% of species died out. All life on Earth today is from the 4% of species that lived the great dying.

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Three quarters of all species on Earth died out in the Late Devonian mass extinction, though it may have been a series of extinctions over several million years, rather than a single event. Life in the sea took a beating but some coral evolved and lived.

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The third largest extinction in Earth's history, the Ordovician-Silurian mass extinction had two peak dying times separated by hundreds of thousands of years. During the Ordovician, most life was in the sea, so it was sea creatures.

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In population genetics, gene flow is the transfer of genetic variation from one population to another.

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The changing of the structure of a gene in DNA

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Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is key the of evolution, the change in heritable traits of a population over time.

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Variation=Mutation
Inheritance=DNA and sexual selection
Selection=selection and genetic drift
Time: migration/gene flow