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What is natural selection in biology?
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Oct 19, 2023 · Learn how natural selection works as the engine of evolution, how it differs from artificial selection, and how it can lead to speciation. Explore the evidence from fossils, genetics, and examples of natural selection in action.
- Natural Selection
The theory of natural selection was explored by 19th-century...
- Speciation
Speciation is how a new kind of plant or animal species is...
- Artificial Selection
Artificial selection is the identification by humans of...
- Natural Selection
Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift. Darwin’s grand idea of evolution by natural selection is relatively simple but often misunderstood. To see how it works, imagine a population of beetles: There is variation in traits.
- Variation and Inheritance
- Selection: Survival and Reproduction
- Time and Adaptation
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Members of any given species are seldom exactly the same, either inside or outside. Organisms can vary in size, coloration, ability to fight off diseases, and countless other traits. Such variation is often the result of random mutations, or "copying errors," that arise when cells divide as new organisms develop. When organisms reproduce, they pass...
Environments cannot support unlimited populations. Because resources are limited, more organisms are born than can survive: some individuals will be more successful at finding food, mating or avoiding predators and will have a better chance to thrive, reproduce, and pass on, their DNA. Small variations can influence whether or not an individual liv...
In generation after generation, advantageous traits help some individuals survive and reproduce. And these traits are passed on to greater and greater numbers of offspring. After just a few generations or after thousands, depending on the circumstances, such traits become common in the population. The result is a population that is better suited--b...
Learn how natural selection works by breaking it down into five steps: Variation, Inheritance, Selection, Time and Adaptation. See examples of how organisms evolve and adapt to their environments through natural selection.
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
4 days ago · Natural selection is the process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype. Learn how natural selection differs from other factors that affect gene frequencies, such as mutation, migration, and random genetic drift, and how it relates to sexual selection and extinction.
- The Editors of Encyclopaedia Britannica
Learn how Charles Darwin proposed the theory of biological evolution by natural selection, based on his observations of organisms on the HMS Beagle voyage. Explore how natural selection works, depends on heritable variation and environmental factors, and causes populations to adapt over time.
Natural selection is a mechanism of evolution that favours organisms with beneficial mutations. Learn how natural selection works, what are adaptations and exaptations, and how Darwin and Wallace developed the theory.
