Below is an instruction from Human. Write a response.
    ### Instruction:
    Is Prader-Willi syndrome inherited ?
    ### Response:
    Is Prader-Willi syndrome inherited? Most cases of Prader-Willi syndrome (PWS) are not inherited and are due to random events during the formation of egg or sperm cells, or in early fetal development. This is usually the case when PWS is caused by a deletion in the paternal chromosome 15, or by maternal uniparental disomy.
    