Atopy is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop.
As of 2012, 63.9 percent of players playing in Major League Baseball are white. There is no way of telling the exact number due to the number of players.
William Edward White, the first black player in major-league history, lived his life as a white man. By Peter Morris and Stefan Fatsis. William Edward White on the 1879 Brown baseball team.