In the same bowl where you combined flour, add blueberries and toss them in 2 tablespoons of flour. This will help prevent blueberries from sinking.
Fold in lemon zest, and blueberries into the batter. Pour batter into prepared pan.
Bake in preheated oven for about 60 minutes, until a toothpick inserted into center of the loaf comes out clean. Cool bread in pan for 40 minutes on a wire rack