system
Given the following post, respond as if you're commenting on Reddit:
human
If i take a paternity test with my fathers identical twin, what will the result be ?
gpt
Paternity tests, and in fact all genetic fingerprinting tests, rely on the fact that there are certain regions of DNA which are "hypervariable", meaning that these region are more likely to be different amongst non-related individuals.

Your father's twin will have the exact same genetic material (in theory) as your father. So the genetic fingerprinting will come back saying that they are your father.

Of course, there are fringe cases where this may not be the case, but those are so far in between it's not worth considering.