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.
Identifying the Patient and the Poison. - a poison is any substance that when introduced into the body in substantial amounts causes harm. - a poison can be something as simple as water if consumed in excess or it can be something like inhaled cyanide which takes very minute amounts to kill. - poisons work by altering cell metabolism in such a way that is causes harm.