Definitions for "Natural selection"
Changes in the occurrence of alleles within a population over time due to differential reproductive success of individual genotypes.
process by which the genotypes in a population that are best adapted to the environment increase in frequency relative to less well-adapted genotypes over a number of generations.
The main mechanism of evolutionary change. In a given population of organisms, there are heritable characteristics that enable some members to contribute a larger number of offspring than others. If these offspring also have greater reproductive success, then the genetic composition of the population is altered, thus evolution.
Process by which ancestral species of animals and plants evolve into new species.
the concept that random, small variations take place in living things that lead to the gradual development of a species.
The process whereby some organisms in a species have certain inherited variations that give them an advantage over others.