We report on a 16-year-old female with duplication 8q24.2----qter and 15q14----pter resulting from a 3:1 segregation of a maternal balanced reciprocal translocation. This mode of unbalanced segregation could be predicted from Pachytene-diagram drawing. Most of her clinical manifestations can be related to the proximal 15q trisomy. To our knowledge there is only one previous report of a similar chromosome constitution.