Definition: Accession refers to a state where an organism has a normal genetic identity, in other words it's a mutation-free or haploid population. The gene pool contains all the alleles that are available in nature. Accession refers to the fact that once a species is established it will not change (haploid) until there is a mutation on some of its genes (normal). In evolutionary biology, accessions can be either: - Purely natural (the organism did not undergo any changes); - Naturalised (the organism underwent some changes but there was no mutation and the gene pool remained unchanged for long enough to allow it to be re-established again). Accession is also a genetic marker that tells us something about the species being studied, which is why accessions are usually used when comparing different populations of interest.
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