Klinefelter syndrome or Klinefelter syndrome, also known as XXY result that appears in the male organism (XY). This term describes how men have an extra X chromosome in almost all of their body cells. The normal human karyotype for males is shown as XY, for a total of 46 chromosomes, while Klinefelter syndrome causes the victim to contain a total of 47 chromosomes. Females contain the set of two X's (XX), rather than having just an . Klinefelter syndrome is named after Dr. Henry Klinefelter who first discovered the symptoms and findings found in men with an extra X. This chromosomal constitution (karyotype) only appears in each of the 500 births, although it is very common for people to say that it is very rare to detect it due. no symptoms or differences in the man's lifestyle. If physical symptoms are identified, they usually develop during puberty development or are experienced when the man is an adolescent....