In terms of evolution, an animal that is ‘fit’ is one that’s adapted to its environment. This concept is at the core of natural selection, although the term ‘survival of the fittest’ has often been ...

The phrase "survival of the fittest" functions principally in evolutionary theory to describe the biological concept of natural selection. English naturalist, geologist, and biologist Charles ...

Today, with access to heretofore unprecedented data sets for the study of human genetic variation, researchers can exploit the genetic signatures of natural selection using novel analytical methods.

To constitute natural selection, the difference in survival and/or reproduction cannot be due to chance, and it must have the potential consequence of altering the proportions of the different ...