Awen maybe your baby will have mahogany hair and skin in between you and your parnter's colour. Apparently all people carry a set of two types of skin colour gene, this can be 2 light genes, 2 dark genes, or 1 of each. And it works in similar way to eye colour, so you could have two parents with a set of dark genes each but they could still have a lighter skinned child due to a granny ancestor having a light gene knocking around.
An old friend of mine has red curly hair, dark golden skin and clear green eyes. Her mum and dad are typically white looking, mum blonde blue eyes, dad red hair and blue eyes, but 8 generations back a woman in their family had a scandalous affair (at the time) with an African guy and my friend's skin (which is beautiful) and curly hair is a throwback to him. My friend's looks are the envy of all of us, as she looks v unusual. Actually she looks a bit like the curly haired model from the M and S tv ads.
It's not just books that assume you are in a couple, wehn i was booking all the antenatal class thingys the woman kept saying bring your partner to that one, i'd say i am single, and then she started talking about the class to do with labour AGAIN she said ooooh def bring your parntner to that one.
I gave up after that!