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 anything that can harm someone if it is 1) used in the wrong way, 2) used by the wrong person, or 3) used in the wrong amount. Some poisons may be harmful if they come into direct contact with your eyes or skin. Others may be toxic if you breathe them or swallow them.