A defect in the human homologue of the Drosophila "period" gene was identified as a cause of the sleep disorder FASPS (Familial advanced sleep phase syndrome), underscoring the conserved nature of the molecular circadian clock through evolution. Many more genetic components of the biological clock are now known. Their interactions result in an interlocked feedback loop of gene products resulting in periodic fluctuations that the cells of the body interpret as a specific time of the day.[citation needed] COUNT 5
QSN1 What is the Drosophila gene the cause of? ANS1 sleep disorder FASPS QSN2 What is the Drosophila gene also known as? ANS2 period QSN3 What is Familial advanced sleep phase syndrome? ANS3 FASPS QSN4 What kind of clock have genetic functions? ANS4 biological clock QSN5 What does the body interpret from the gene feedback loop? ANS5 time of the day