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.
â¢ Venom and poison are similar meaning words, but both are different from each other. â¢ Poison is a toxin that can harm us when swallowed or inhaled while a venom turns into a toxic substance only when it is injected or administered into our bodies by animals like snakes and spiders.