Cleft chin is a genetic defect. It is the result of the chin bone never forming together. Cleft chins are genetic. It is passed down from parent to child. Cleft chin is the most predominate among people of germanic and west slavic (i.e., polish) ethnicities. Notably the former prussian areas of Poland. It is very common in that part of the world and among descendants of people originating in that part of Europe.
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