22q11.2 deletion syndrome is caused by the deletion of a small section of chromosome 22. It results in a cleft palate, heart defects, autoimmune disorders, and more. The symptoms vary wildly and can be accompanied by learning disabilities and mental illness. Cystic fibrosis is caused by a point deletion.
The melody of Happy Birthday to You comes from the song  Good Morning to All , which has been attributed to American siblings Patty Hill and Mildred J. Hill in 1893, although the claim that the sisters composed the tune is disputed.
Birthday song redirects here. For the song by 2 Chainz, see Birthday Song. This list of birthday songs contains songs which are the equivalent of Happy Birthday To You, sung around the globe on birthday occasions. 1 Based on the tune: Good Morning To All. 2 Other traditional birthday songs. 3 Less canonical birthday songs and pop-music songs.