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 a substance that can harm or even kill you. Arsenic and cyanide are both types of poisonâso stay away from them! Mean people can also be poison, so stay away from them too. Poison refers to the harmful substance itself, or the act of giving it to someone. Poison often shows up in murder mysteries because itâs a sneaky way to get rid of someone. We also use poison metaphorically for things that tend to ruin something. A really obnoxious friend who always insists that he knows more than everyone else might poison the atmosphere at a dinner party. Jealousy can poison a good relationship.