Background Paragraph: Klinefelter's syndrome is caused by the presence of one or more extra copies of the X chromosome in a male's cells. Extra genetic material from the X chromosome interferes with male sexual development, preventing the testicles from functioning normally and reducing the levels of testosterone. Triple X syndrome (trisomy X) results from an extra copy of the X chromosome in each of a female's cells. Females with trisomy X have a lower IQ than their siblings. Turner syndrome results when each of a female's cells has one normal X chromosome and the other sex chromosome is missing or altered. The missing genetic material affects development and causes the characteristic features of the condition, including short stature and infertility. 
Story: Two brothers born three years apart were very different. Jim had no genetic abnormalities, while Danny had Klinefelter's syndrome.
Which brother did not have trisomy X? Which brother didn't have any extra copies of the X chromosome in his cells? Which brother didn't have any interference from the extra copies of the X chromosome in his cells? Which brother had interference from the extra copies of the X chromosome in his cells? Which brother had normal levels of testosterone? Which brother had one or more extra copies of the X chromosome in his cells? Which brother had reduced levels of testosterone? Which brother had testicles that were functioning normally? Which brother had testicles that weren't functioning normally? Which brother had trisomy X?