1977 On September 30th, a young boy was born in a farmer's house in Liaoning. Except his hands, feet, palms and lips, his body is covered with different lengths of hair. These hairs are darker and longer than those of ordinary people, much like the ancestors of human beings-apes. What appears in this young man is atavism.
According to the British "Daily Express" and "Times" reported on the 7th, the most critical step in human evolution is to be able to walk upright with two feet, thus freeing hands. However, due to a rare genetic defect, five brothers and sisters of a family in Turkey have a shocking phenomenon of "retrogression and atavism": they can't walk upright, but can only crawl and walk on four hands and feet like animals! This strange Turkish family was made into a documentary "A Family Crawling on All fours" by BBC.
PS: For example, a hairy child born with hair all over his body is an atavistic "degeneration" phenomenon of human hair tissues and organs, and a person with rotating ears at birth can be classified as an atavistic "degeneration" phenomenon of nervous system, and a person with tail at birth can be classified as an atavistic "degeneration" phenomenon of degenerated organs, so it can be seen that the place where atavism appears is uncertain. By analogy, the function of other organs of the human body can not rule out the "degradation" of atavism.