Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy. Add egg whites, then egg, beating well after each addition. Beat in lemon juice and extracts. Combine the flours, baking powder, salt and baking soda; add to the creamed mixture alternately with yogurt.
Transfer to a 10-in. fluted tube pan coated with cooking spray. Bake until a toothpick inserted in the center comes out clean, 35-40 minutes. Cool for 10 minutes before removing from pan to a wire rack to cool completely.
For glaze, in a small bowl, whisk the confectioners' sugar, lemon juice and lemon zest until blended. Stir in apricots. Drizzle over cake.