Chromosome 18 conditions are caused by a change in a person’s genetic makeup. There is detailed information on the US Chromosome 18 website here: http://www.chromosome18.org/genetic-basis/
18p-
18p- occurs when a piece of the p arm of the 18th chromosome is missing . The p arm is the short arm of the chromosome 18. You can find detailed information on the American Chromosome 18 website here; http://www.chromosome18.org/18q/
18q-
18q- occurs when a piece of the q arm of the 18th chromosome is missing . The q arm is the long arm of the chromosome 18. You can find detailed information on the American Chromosome 18 website here; http://www.chromosome18.org/18q/
More detailed information on all the Chromosome 18 conditions are given on the US Chromosome 18 website, http://www.chromosome18.org/
Follow the link at the top, “About CH18 Conditions”
