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.
1 Poison (game), a children's game.  In software engineering, a poison is a special value given to uninitialized or freed memory; reading this memory provides only dummy data (however identifiable) or may cause the software to voluntarily be trapped (e.g. pointer to nowhere).