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.
toxic. adj. 1. of, relating to, or caused by a toxin or poison; poisonous. 2. (Pathology) harmful or deadly. 3. (of a financial asset) likely to cause significant loss to the holder.