Randfan, I based my response on what I remember from a question asked in my biology class a long time ago and personal observations of several mixed couples that I have known. I read these two pages cited below to assure myself that I remembered correctly. Of course, back then (late 60s), there wasn't much genetic detail, just Mendelian type observations.
The amount of melanin (two kinds of melanin, actually) in the skin is the result of at least three different genes interacting. A quote from one of the sources below:
"The words dominant and recessive are placed in quotation marks because these pairs of alleles are not truly dominant and recessive as in some of the garden pea traits that Gregor Mendel studied."
http://waynesword.palomar.edu/lmexer5.htm
http://www.woodrow.org/teachers/bi/1997/makeface/bookskncol.html
The point was that a white parent and a black parent had a much greater chance of producing a non white child because there are so many combinations of alleles that are not white.
Sure that's true, but at what point is skin white or black? How does Mediterranean or Mid-East "olive" skin get counted? Look at the figures on the pages I ref, and tell me where the dividing line should be - where would you say that this child is definitely black? Do you actually mean the child has to be an albino in order not to count as black?
Come on, you all, don't tell me that all the sudden everyone here has gotten skin-color conscious? No one has actually observed any mixed race children? Just how much white blood is required before a person passes for white, in places where that is still a distinguishing factor?
PS: I did not know what Jackson's putative offspring look like (I have never been overly enamored of him, personally), I was reacting to the general genetics question. Point to ponder: if, as EEM says Jackson's father had blue eyes, that almost certainly assures him having some white genetic within him. Assuming a mother is average white (say, equivalent to Hillary Clinton or Barbara Bush. or - here it gets dicey - Pocahontas or Indira Ghandi) how much white or black would a child be? May guesses? Enough to pass for white to the casual observer?