How are your fingerprints and your cat's black-and-white spots related?

They're both created by basically random biological processes!

Here, some new research into the development of black-and-white cats' patterning sheds new light on what causes each cat's distinctive appearance (at Gizmodo): "We've Been Completely Wrong About How Cats Get Their Black-and-White Spots."

And here is a quick, fun explanation of how fingerprints develop (not as straightforward as you might think!), from Scientific American: "Are one's fingerprints similar to his or her parents in any discernable way?"