Humans have a complex history regarding genetics and gene flow. Evidence suggests that not only are we all
related to a single group/individual in Africa, but that our species has interbred with at least two other species
of hominid (and evidence points to a third).
What does this mean as far as our cladistic “family tree;” and what does it mean to say we belong to the
species Homo sapiens?
How do we classify species, when such interspecies gene flow occurs?
Are species distinct categories, or do they lie on a continuum?