In newborns, Prader-Willi Syndrome will cause muscle weakness, poor feeding, and slow development. In older people, they will become constantly hungry, will led to obesity, and type 2 diabetes.

It is estimated that one in about every 12,000 to 15,000 people get Prader-Willi Syndrome (PWS) (https://www.pwsausa.org/basic-facts/). PWS affects males, females, races, and ethnic groups all the same.

"Most PWS cases weren't inherited. Most are caused by maternal uni parental disomy or a deletion in the paternal chromosome 15" (https://ghr.nlm.nih.gov/condition/prader-willi-syndrome)

Prader-Willi Syndrome is caused by a deletion of the chromosome 15. It is autosomal and a recessive gene.