Human Evolution

Human beings belong to the family of Hominidae.
Within this family they are a single
living species, Homo sapiens. Studies of DNA
sequences obtained from different parts of the
human genome from populations living in
different regions of the world indicate that the
genetic diversity of humans living today is surprisingly
limited. The origin of today’s humans
can be traced back to about 100000 to 300000
years ago in Africa. From here, an anatomically
modern H. sapiens ancestor spread out over the
earth and diversified. About 90% of the overall
genetic variation in humans is among individuals
and only 10% among different ethnic groups.
There are no races of H. sapiens; rather, different
ethnic groups have developed in different
geographic regions during the past 30000–
40000 years