Populations Without variation (which arises from mutations of DNAmolecules to produce new alleles) natural selection would have nothing on which to act. A populationis a group of individuals living in the same geographical area and sharing a common gene pool. Thegene poolis the sum of all genetic information carried by the members of a population.All genetic variation in a population is generated by mutation. Mutationis any heritable change in DNA. Mutations can be changes of a single nucleotidebase or may involve changes in chromosome number. Whether a mutation is good, neutral, or harmful depends on how it affects survival and reproductive success.Population Genetics A population is a group of potentially interbreeding organisms of the same species occupying a certain area. Members of a population vary from one another. This variation is the raw material on which natural selectionoperates.There are several types of mutations, both at the gene-level and the chromosome-level. Gene mutations provide new alleles, making these mutations the ultimate source
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