Most cells in the human body are produced by mitosis. These are the somatic (or vegetative) line cells. Cells that become gametes are referred to as germ line cells. The vast majority of cell divisions in the human body are mitotic, with meiosis being restricted to the gonads.
Technically, the caste is called Patidar, and Patel is the most common last name among its members. For all intents and purposes, Patel and Patidar are the same, says Nilam. They weren't officially recognized as a caste until the British-run government declared them one in the 1930s.
While the surname PATEL does not appear in Bardsley's A dictionary of English and Welsh surnames(London, 1901), I encountered a whole batch of people of this surname in court rolls of the manors of Walsham le Willows in Suffolk, in the 14th century. These seem highly unlikely to have any connection with India.