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By mutations !
Well it depends, there is more variation in sexual reproduction than in asexual reproduction. This is due to homologous crossover, the switching of 2 of the same alleles for 2 genes. Other wise, mutations or natural selection. Hope this helps.
yeah so mutations occur during segregation of chromosomes.
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Mutations don't occur during segregation of chromosomes, they occur during DNA replication!! @rushwr
@twistnflip has a better answer, because most of variation is archieved through the process he described.
However, you might want to add recombination to your answer (which is basically the term for what @twistnflip explained)
http://www.geneticseducation.nhs.uk/mededu/changes-to-dna-affect-gene-dosage-or-function/errors-during-meiosis @neils5x9 It does occur ! :)
@niels5x9 I hope that proves it :)
@rushwr That is not segregation of chromosomes but DNA replication also in practise, very little of the variation is caused by mutations, most by crossing over ;)