Pictures(:

http://www.google.com/imgres?imgurl=http://www.anomalousmaterial.com/movies/wp-content/uploads/2010/08/bates-kathy01.jpg&imgrefurl=http://www.anomalousmaterial.com/movies/2010/08/hollywood-fantasy-draft-round-4/&usg=__TwikoTwgtuOAmg53ghJYoYhRpYY=&h=315&w=315&sz=18&hl=en&start=99&zoom=1&tbnid=XlqiZl8K-e9b2M:&tbnh=136&tbnw=155&ei=_7aATe3uDNSWtweH5ojfCA&prev=/images%3Fq%3Dthe%2Bperfect%2Bperson%26um%3D1%26hl%3Den%26biw%3D1259%26bih%3D599%26tbs%3Disch:10%2C2344&um=1&itbs=1&iact=hc&vpx=1008&vpy=178&dur=4825&hovh=225&hovw=225&tx=168&ty=109&oei=37aATfq4ENKRgQfxvvWICA&page=6&ndsp=19&ved=1t:429,r:5,s:99&biw=1259&bih=599
This is a random woman who was selected off of the internet who does NOT have Jacobs Syndrome. Jacobs Syndrome has no special physical features or deformations. 

http://www.google.com/imgres?imgurl=http://home.earthlink.net/~heinabilene/karyotypes/XYY.jpg&imgrefurl=http://home.earthlink.net/~heinabilene/karyotypes/trixyy.htm&usg=__M1BkgDITpEoLi8qo-Pf-HdlfvCY=&h=750&w=1000&sz=46&hl=en&start=0&zoom=1&tbnid=551M_0j6NujUcM:&tbnh=123&tbnw=164&ei=_beATb_PFsS9tgfJ77HtCA&prev=/images%3Fq%3Dxyy%2Bsyndrome%26um%3D1%26hl%3Den%26biw%3D1259%26bih%3D599%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=575&vpy=110&dur=2812&hovh=194&hovw=259&tx=87&ty=132&oei=2beATcKPN46tgQfykpidCA&page=1&ndsp=21&ved=1t:429,r:3,s:0

This picture represents the karyotype of a male with Jacobs Syndrome/ 47, XYY Syndrome.  If you look at the bottom right of the above photograph you will see that there is an extra "Y" chromosome.  This is how the genetic disorder is begun.