Not necesarily. If you, and your lady, get some sun hitting your eyes daily, some hitting your skin, and eat a lot of carbs along with physical exercise, that baby is gonna look black because your strong active genes will combine with hers. Even though her genes may not be strong for things dealing with the sun, as long as she is activating them, your son will still have strong genes that deal with the sun because you have much stronger genes then the mother. Now, the child may be lighter then you but, not by much, unless the mother always wears sunglasses, and never let the sun hit her skin for at least 20 minutes a day. And she never eat whole fatty, and protein rich foods like nuts or seeds.
What we call white people, are just black people with certain genes that aren't strong. For instance, the skin is light because it can't handle too much UV rays. The muscles, and bones, are smaller because they don't usually eat as much carbs, and calcium rich greens as blacks do. They tend to eat more protein then carbohydrates. This is on average, things are changing, and a lot of blacks don't eat like people did in the early 80's and prior.
I'm not dissing whites, the shyt is corny now, just showing why we are different. Good people come in all races.