Sources

Picture of eye- http://www.kellogg.umich.edu/theeyeshaveit/congenital/tay-sachs.html
Brain scan- http://www.pediatricneurosciences.com/article.asp?issn=1817-1745;year=2011;volume=6;issue=2;spage=110;epage=113;aulast=Bano
Pedigree- http://projects.cbe.ab.ca/Diefenbaker/Biology/Bio%20Website%20Final/notes/classical/6_human_pedigree_analysis.htm
Knowledge- http://ghr.nlm.nih.gov/condition/tay-sachs-disease
http://serendip.brynmawr.edu/biology/b103/f02/web1/lfriedman.html