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Preheat oven to 350 degrees. Grease and flour two 8-inch round cake pans.
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Sift together the flour, baking powder and salt. Set aside.
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In the bowl of your mixer, cream together the butter and sugar until light and fluffy, about 5 minutes.
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Add the egg yolks one at a time.
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Stir in the vanilla.
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Run the mixer or beaters for an additional 3-4 minutes or until the batter becomes pale and light.
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Gradually add in the flour mixture alternately with the milk, mixing just until incorporated.
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In a medium-sized microwave save bowl, heat jam for 20 seconds or until warm, but not hot.
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Stir the buttermilk and sugar to the warm jam.
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Stir in 2 cups of the cake batter into the jam mixture, mixing only until just combined.
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To make the zebra stripes, scoop a small amount of the yellow cake batter into the center of the pan and then alternate with a scoop of the berry cake batter directly on top of the first. Continue adding yellow cake batter and berry batter on top of each layer until you have used half of both batters; repeat with second pan. As the batter sets, it will spread to the edges of the pans.
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Bake cakes 25 to 30 minutes, or until a toothpick inserted into the middle of the cake comes out clean. Let the cake cool in the pans for 15 minutes, then remove from the pans and place on a wire rack to finish cooling.