Different groups of hair cells react to different frequencies, with hairs detecting low notes at one end of the cochlear spiral and high notes at the other. Humans accumulate genetic changes all the time, as has become obvious through whole genome sequencing studies. During this time they can proliferate exponentially, so any genetic change that gives a survival advantage spreads very quickly. Photograph: Getty ImagesThe only genetic changes in humans we ever hear about are those producing diseases such as cystic fibrosis. Has anyone identified any genetic changes within recent generations that make individuals possessing them “more fit” to thrive in today’s environment?

Source: The Guardian October 09, 2016 08:45 UTC