Periods of Cultural Evolution and Modern Man
Paleolithic period: Stone age. Age of tools of stones and bones, cave paintings.
Mesolithic period: Age of domestication of animals and learning reading and writing develop language.
Neolithic period: Age of agriculture and manufacture of pottery, clothes and this period further sub-divided into following ages:
Bronze age (ancient age)
Iron age (modern age)
American Indian Polynesian
All human races have the same number of chromosomes (46) and banding pattern. All human races can interbreed and produce fertile offsprings, so all belong to the same species.
On comparing the amount of DNA in human diploid cells and that of gorilla chimpanzee, and great apes (2N = 48), it is observed that the DNA contents in them are similar proving common ancestry of all of them. On staining the autosomal chromosome number 3 and 6 of man and chimpanzee with a specific dye, it was found that bending pattern of chromosomes (chromosome number 3 and 6) of man and chimpanzee is quite similar.