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Evolution, theory in biology postulating that the various types of living things on Earth have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations.
Evolution reflects the adaptations of organisms to their changing environments and can result in altered genes, novel traits, and new species.
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
Distinguish biological evolution of populations from changes to individual organisms within their lifetimes. Cite evidence for evolution. Distinguish between homologous and analogous structures. Recognize common misconceptions about evolution.
also : the scientific theory explaining the appearance of new species and varieties through the action of various biological mechanisms (as natural selection, genetic mutation or drift, and hybridization) Since 1950, developments in molecular biology have had a growing influence on the theory of evolution. Nature. b.
An introduction to evolution, explaining what it is and how it works, including mechanisms like selection, mutation, migration, and speciation.
Modern evolutionary biology continues to expand through the integration of molecular genetics, computational biology, and other scientific disciplines. ... Definition of Evolution. Evolution is the process by which species change over time through the gradual accumulation of genetic variations, driven by mechanisms like natural selection ...
Evolution is a process that results in changes in the genetic content of a population over time. There are two general classes of evolutionary change: microevolution and...
Key Terms. evolution: the change in the genetic composition of a population over successive generations. inheritance of acquired characteristics: hypothesis that physiological changes acquired over the life of an organism may be transmitted to its offspring.
Evolution itself is a biological phenomenon common to all living things, even though it has led to their differences. Evidence to support the theory of evolution has come primarily from the fossil record, from comparative studies of structure and function, from studies of embryological development, and from studies of DNA and RNA (ribonucleic ...