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, on the other hand, is a toxic substance that is usually secreted from an organismâs external covering, be it skin or leaves. Poisons are not injected instead they have to come in contact with skin or be ingested to cause harm.