Sources

•  http://www.ornl.gov/sci/techresources/Human_Genome/medicine/genecounseling.shtml
• http://emedicine.medscape.com/article/1119902-overview#showall
• http://dominancerelationship.blogspot.com/2007/08/dominance-relationship.html
• http://dermnetnz.org/systemic/xeroderma-pigmentosum.html
• http://resources.mhs.vic.edu.au/science/resources/geneticssummary.htm#dominant
• http://www.patient.co.uk/doctor/Xeroderma-Pigmentosum.htm
• http://www.healthfinder.gov/scripts/searchContext.asp?topic=14486&branch=6&show=1
• http://rarediseases.info.nih.gov/GARD/Condition/7910/QnA/28106/Xeroderma_pigmentosum.aspx

 These are the websites I got all of my information from, I suggest visiting these sites for more info on XP.

I wish you all luck in dealing with XP.