#sex_chromosome__sexchromosome  a chromosome that determines the sex of an individual; "mammals normally have two sex chromosomes"
  supertype:  #chromosome  a threadlike body in the cell nucleus that carries the genes in a linear order
  subtype:  #X_chromosome  the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"
  subtype:  #XX  (genetics) normal complement of sex chromosomes in a female
  subtype:  #XXX  (genetics) abnormal complement of three X chromosomes in a female
  subtype:  #XXY  (genetics) abnormal complement of sex hormones in a male resulting in Klinefelter's syndrome
  subtype:  #XY  (genetics) normal complement of sex hormones in a male
  subtype:  #XYY  (genetics) abnormal complement of sex hormones in a male who has two Y chromosomes
  subtype:  #Y_chromosome  the sex chromosome that is carried by men; "human males normally have one X chromosome and one Y chromosome"

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