In a medium-sized mixing bowl, combine the ricotta cheese, eggs, 1 cup of the mozzarella and ½ cup of the Parmesan. Stir until smooth. Set aside.
In another mixing bowl, combine the marinara and Alfredo sauces and stir until smooth.
To assemble lasagna, spread 1 cup sauce mixture in 13" x 9" baking dish. Layer 4 uncooked lasagna noodles, then 1 cup sauce mixture and ½ of the ricotta mixture; repeat. Top with remaining 4 noodles, then sauce mixture and remaining mozzarella and Parmesan cheeses.
Cover with aluminum foil and bake 1 hour. Remove foil and bake 10 minutes. Let stand 10 minutes before serving.