sentence: Genetic variation is increased by gene mutations.
sentences_after: DNA does not always reproduce exactly. Rare changes occur, and these changes can be inherited. This gives rise to genetic variation, which is the seed-corn of evolution. Sexual reproduction, by the crossing over of chromosomes during meiosis, spreads variation through the population. Other events, like natural selection and drift, reduce variation.
concept_name: genetic variation
headings: Evolution Darwin's theory Variation Inherited variation
categories: History of science