Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Mosaic trisomy 14 ?
    ### Response:
    What causes mosaic trisomy 14? Individuals with mosaic trisomy 14 have a duplication of chromosome 14 material in some of their cells, while other cells have a normal chromosomal makeup. The additional chromosomal material is responsible for the features that are characteristic of the condition.
    