26 Apr. 2014. Grohol, John M., PSY.D. "Posttraumatic Stress Disorder (PTSD)."PsychCentral.com. Psych Central, 19 Nov. 2013.
Web. 26 Feb. 2014. http://www.mayoclinic.org/diseases-conditions/ocd/basics/definition/con-20027827 "Obsessive-compulsive Disorder (OCD)." Definition. N.p., n.d. Web.
Duchenne Muscular Dystrophy (DMD) is a genetic mutation that is recessive and X- linked. It is located on the ‘p’ arm of the X chromosome (to be more specific, the Xp21 chromosome). DMD is also lethal meaning that the person affected by DMD will die because of it. Because DMD is located on the X chromosome, it mostly affects males. It is immensely uncommon for a female to inherit this gene because her father would have to have DMD and her mother would have to carry the gene.
Genetic disorders can be caused by many of the 46 chromosomes in human cells. This specific disorder is linked to a mutation in the long arm of the X, or 23rd chromosome. The mutation is recessive, meaning a normal X chromosome can hide it. Females have two X chromosomes allowing them to hide the mutated recessive one, making them a carrier of the gene, while males only have one X chromosome, meaning that they are unable to hide the mutation and they become effected by the disease. Therefore if a male carries the gene, he is affected because he has no way of dominating the recessive gene, but if a female carries it, she is only a carrier and has a 50/50 chance of passing it on to her baby.
Web. 1 Feb. 2014. . "Polio." Center for Disease Control and Prevention. CDCP, n.d.