Evolution
Evolution
Evolution (pronounced: /ˌiːvəˈluːʃ(ə)n/) is a scientific theory explaining the diversity of life on Earth. It is a process that results in heritable changes in a population spread over many generations.
Etymology
The term "evolution" comes from the Latin word "evolutio" which means "unrolling" or "unfolding". It was first used in English in the 17th century to refer to an orderly sequence of events, particularly in life or the natural world.
Definition
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species are related and gradually change over time.
Related Terms
- Natural selection: The process where organisms better adapted to their environment tend to survive and produce more offspring.
- Mutation: A change in a DNA sequence, usually occurring because of errors in replication or repair.
- Genetic drift: Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
- Speciation: The formation of new and distinct species in the course of evolution.
- Adaptation: The process by which an organism or species becomes better suited to its environment.
- Fossil: The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
See Also
External links
- Medical encyclopedia article on Evolution
- Wikipedia's article - Evolution
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