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.
Define toxic. toxic synonyms, toxic pronunciation, toxic translation, English dictionary definition of toxic. adj. 1. Of, relating to, or caused by a toxin or other poison: a toxic condition; toxic hepatitis. 2. Capable of causing injury or death, especially by...