The statement, “it is the population that evolves, not the individual,” came from the definition of evolution as change of allele frequency through time in a population. Population pertains to a collection of individuals with different set of traits. An individual organism does not evolve and retain the same genes through their life. However, when population is evolving, the ratio of the different genetic types changes.
Explain the statement "It is the population, not the individual, that evolves."
Define the terms population, species, and gene pool.