All extant copies of a gene eventually coalesce; this occurs because

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Coalescence in genetics refers to the process where all copies of a gene trace back to a single ancestral copy. This often occurs when a particular allele becomes fixed in the population, meaning that it is the only allele present in the population for that gene, leading all individuals' genes to coalesce back to the common ancestor that first had the fixed allele.

All Extant Copies of a Gene Eventually Coalesce; This Occurs