Prader-Willi syndrome is caused by a missing gene on chromosome 15. Normally, parents each pass down a copy of this chromosome. The defect can occur in a couple of ways: The father's genes are missing on chromosome 15; There are defects or problems with the fatherâs genes on chromosome 15
poison meaning, definition, what is poison: a substance that can make people or animals ill or kill them if they eat or drink it: . Learn more.
What does the phrase poison chalice mean? The poison chalice is a term used when something was first percieved as being very good and helpful, then ends up being very bad. Often used in relation to societies to â¦ see how or why some of the past civilizations fell.