When all individuals in a population with a certain illness have the same mutation,which present-day patients inherited from shared ancestors,it is an evidence of

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The presence of the same mutation in all individuals with a certain illness indicates a founder effect, where a small group of individuals with the mutation became isolated from the larger population and passed on the mutation to their descendants. This is different from random mating, migration, or population bottlenecks, which could also affect genetic variation but do not necessarily result in the same mutation found in all affected individuals.

When All Individuals in a Population with a Certain Illness