Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Tetrasomy X ?
    ### Response:
    Tetrasomy X is a chromosome disorder that only affects females and is caused by having four copies of the X chromosome instead of two. Females with tetrasomy X have a total of 48 chromosomes in their cells, so this condition is sometimes written as 48, XXXX.
    