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.
Poison is defined as a substance that causes disturbances to organisms stemming from a chemical reaction. In essence, poison is a catch all word for toxins and venom. We can classify poisons in various types. Venom, on one hand, is very different.