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.
1 33% of MLB teams have a red and blue (navy or royal) color scheme, compared to 20% in the NBA and 12.5% in the NFL. 2  Red is the most common color in MLB (14 teams) and the NBA (13) , while navy blue is the most common in the NFL (10) . 3  The NFL has more color variety.