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 a substance that has a noxious effect on living organisms. Can derive from another living organism or from inorganic material, for instance a heavy metal or cyanide. A toxin is a poison produced by a living organism. A venom is a toxin injected from a living organism into another. A venom therefore is a toxin and a toxin is a poison, not all poisons are toxins, not all toxins are venoms. Written Apr 13, 2015 Â· View Upvotes.