In large bowl, beat cake mix, water, oil and eggs with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Reserve 1 1/2 cups batter in small bowl; set aside. Pour two-thirds of the remaining batter into pan; spread evenly. Stir dry gelatin and extract into the reserved 1 1/2 cups batter. Drop orange batter by heaping tablespoonfuls randomly onto batter in pan; repeat with remaining yellow batter. Swirl batter with knife.