TIL In Finland about one in five persons carries a gene defect associated with at least one Finnish heritage disease, and about one in 500 children born is affected. It is attributed to a population bottleneck among ancestors of modern Finns, estimated to have occurred about 4000 years ago.

TIL In Finland about one in five persons carries a gene defect associated with at least one Finnish heritage disease, and about one in 500 children born is affected. It is attributed to a population bottleneck among ancestors of modern Finns, estimated to have occurred about 4000 years ago.