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natural selection
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Charles Darwin: On the Origin of Species
How Charles Darwin developed the theory of evolution
Four kittens with different fur patterns-three tabby and one black-and-white-lying together in a box, illustrating genetic variation among offspring.
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Charles Darwin: On the Origin of Species
Charles Darwin: On the Origin of Species Title page of Charles Darwin's On the Origin of Species by Means of Natural Selection, 1859.

natural selection

biology
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natural selection, process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype, or genetic constitution. A brief treatment of natural selection follows. For full treatment, see evolution: The concept of natural selection. In natural selection, those variations in the genotype (the entire complex of genes inherited from both parents) that increase an organism’s chances of survival and procreation are preserved and multiplied from generation...

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