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.
A poison: is any chemical or substance that enters the body that has the ability to cause harm either internally or externally (or both). Eg. overdose of drugs/medications. â¦  ANS2: Poison is defined by the Department of Transportation (DOT) as anything with an LD50 Oral Rat less than 200 mg/Kg.oison is ingested by the victim through eating the poisonous animal n most cases. Of course, don't touch something poisonous and then your mouth. Venom is injected into the v â¦ ictim by fangs, stingers, spines, etc.