Hey, I'm just confused about a detail in my fictional story. I will give a disclaimer that I hate studying genetics and I'm suck at it.
Yet, wouldn't be it hard to determine the boundary of "race" genetically speaking (human race)? Like I haven't seen such "race-specific gene," sure some traits are more frequent or rare in certain race but there is no something so specific right? Not to mention varieties inside a "race" can be very high, even phenotypically speaking.
Plus due to the human mix with each others since they know how to fuck, I think it's hard to determine a "pure race" or "something specific to a race," we are more intertwined rather than separated.
PS: I just wanted to justify a character's (C1) response who is being asked by another character (C2) how does he know C1 knows he is a member of certain race.
C1 answered that he is not actually sure, but some common traits of that race present in C2 (including a supposedly rare recessive trait, which I tried to make it as founder effect with bullshit reasoning). He is only sure because a member of C2's race said so.
Also my story is fantasy.