Cook pasta according to package directions; drain. Rinse with cold water and drain again. Toss apple slices with lime or lemon juice to coat. In a large mixing bowl combine the cooked pasta, apple, turkey, strawberries, and celery.
For dressing, in a small mixing bowl combine yogurt, mayonnaise dressing or salad dressing, milk, mustard, and celery seed. Drizzle dressing over pasta mixture; toss gently to coat. Top with marjoram. Makes 8 side-dish or 4 main-dish servings.