Members of two populations in different parts of the world have the same form of inherited breast cancer.The affected individuals in each population have only one specific mutation,but it is different between the two populations.An explanation for this mutation difference among these populations is

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The presence of the same form of inherited breast cancer with different specific mutations in two geographically separated populations is likely due to a founder effect. This occurs when a small group of individuals from a larger population settle in a new area and become isolated reproductively from the original population. The isolated population will have a reduced genetic diversity compared to the original population, and certain alleles may become more frequent due to chance. The presence of different mutations in each of the two isolated populations suggests that the mutations arose independently after the populations became geographically separated.

Members of Two Populations in Different Parts of the World