Suppose concordance data were collected from a cohort study of twins to study the genetic contribution to the onset of type 1 diabetes, also called juvenile diabetes. both monozygotic (identical) twins and dizygotic (fraternal) twins who grew up together in the same household were included. the concordance rate was found to be 68% among monozygotic twin pairs and 3% in dizygotic twin pairs. what general conclusion about type 1 diabetes can be drawn from these results?