The origin of the human species is a different issue altogether. In particular, there is no well-defined "first human" but (given a family tree going back hundr

The origin of the human species is a different issue altogether. In particular, there is no well-defined "first human" but (given a family tree going back hundreds of thousands of years) there is a well-defined first common ancestor of the Y chromosome (because it is passed down asexually from father to son).