Increased the cranial capacity of the human lineage from the small brain of Australopithecus to human ancestors of three million years ago which was less than 500 cc in volume, to a brain nearly three times as large in modern humans. It comes under

In directional selection, more individuals acquire value other than the mean character value. The gradual increase in brain size from Australopithecus to Homo sapiens has been interpreted as the result of consistent directional selection at the population level for larger brains.