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.
Best Answer: 25 players on the Active Roster - playing on the MLB team. There are a total of 40 players on the Team Roster (includes the 25 plus 15 in the minors who can be called up to replace a player on the Active Roster). There are a total of 9 players in the field playing defensive positions. Source(s):