There are 3 billion base pairs in the human genome. A simple rearrangement of the location of ONE base pair changes the entire final product. It could be a change like whether or not it has brown eyes or blue eyes, or straight hair or kinky hair (though this is not to suggest that such a simple change would make the difference between being a black or a man, as the DNA of blacks is closer to apes than it is to men).
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*Warning to Fundies reading this post: I'll be using a big scientific sounding word in my reply. You may want to avert your eyes so as not to have to look something up.*
Actually, there is less variation in DNA between blacks and whites than you might think. The differences between typical "white" and "black" genes are actually less than those observed within either race, which is why most geneticists don't even consider there to be separate races within the human population.
Not to mention that altering a single base pair will, in all likelyhood, make absolutely no difference at all. Which is a very convenient thing, otherwise we'd all be dying of cancer even before growing that extra head.
Hey, CousinTed da' engineer! I'll get on the racist train if you let me ride in the cab! If you have a push/pull train, can I ride in the engine for the return trip?
It's uncanny how these people can so blithely pronounce 19th-century beliefs and make it sound as if they are backed up by 21st-century science, when 21st-century science actually refutes every word of what they claim.
TDR,
Let's see...humans have around 20-25 thousand genes, only four to seven genes vary with melanin level, and around thirty to forty other genes due to genetic diversity. That means the variation between any two humans is less than 0.01%. Now, Ape is a very odd term to use because; 1, Ape is a Superfamily, comprising of thousands of species; and 2, we are apes due to our physiology. So you are as related to apes as a black person.
Confused?
So were we! You can find all of this, and more, on Fundies Say the Darndest Things!
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