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.
See also poison. antidote. an agent that counteracts a poison. one that neutralizes the poison by changing its chemical nature. one that prevents absorption of the poison. one that counteracts the effects of the poison by producing opposing effects.