Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Chromosome 1p deletion ?
    ### Response:
    Chromosome 1p deletion is a chromosome abnormality that occurs when there is a missing copy of the genetic material located on the short arm (p) of chromosome 1. The severity of the condition and the signs and symptoms depend on the size and location of the deletion and which genes are involved.
    