Understanding 23andMe and Photic Sneeze Reflex

The video explores the phenomenon of sun sneezing, known as the photic sneeze reflex. It delves into historical theories by Aristotle and Francis Bacon, discusses potential evolutionary advantages, and explains the genetic basis of the reflex. The video highlights a study identifying a DNA change on the second chromosome linked to sun sneezing and suggests the involvement of the trigeminal nerve. It concludes with a mention of 23andMe's role in genetic testing and personal DNA insights.

What is another name for the photic sneeze reflex?

• Autosomal recessive disorder

• Autosomal dominant compelling helio ophthalmic outbursts syndrome

• Photic sneeze syndrome

• Helio sneeze disorder

What was Aristotle's explanation for sun-induced sneezing?

• The sun's rays stimulate the optic nerve

• The sun's light causes eye irritation

• The sun's heat causes sweating inside the nose

• The sun's brightness causes a reflex action

What evolutionary advantage was initially thought to be associated with the photic sneeze reflex?

• It reduces the spread of diseases in sunlight

• It helps in better vision in sunlight

• It improves hearing in bright environments

• It enhances the sense of smell

What percentage of the population is estimated to have the photic sneeze reflex?

• 5 to 10 percent

• 18 to 35 percent

• 70 to 80 percent

• 50 to 60 percent

On which chromosome is the gene responsible for the photic sneeze reflex located?

• Third chromosome

• First chromosome

• Second chromosome

• Fourth chromosome

Which nerve is thought to be involved in the photic sneeze reflex?

• Trigeminal nerve

• Vagus nerve

• Optic nerve

• Facial nerve

Why are photic sneezes generally considered harmless?

• They are a natural reflex with no side effects

• They are not linked to any serious health conditions

• They occur only in bright sunlight

• They do not affect daily activities

What is the primary goal of 23andMe?

• To give people insight into their own DNA

• To offer health insights

• To provide ancestry information

• To analyze dietary habits

How does 23andMe collect DNA samples from customers?

• Saliva sample

• Blood test

• Hair sample

• Skin swab

What can customers learn from 23andMe's DNA analysis?

• Their ideal exercise routine

• Their genetic ancestry and health traits

• Their future career paths

• Their favorite foods