After 32 generations (~800 years) you have more genealogical ancestors than there are base pairs in human DNA. There literally isn’t enough resolution to store a “record” of each of your ancestors, even if you inherited exactly 1 base pair from each ancestor.
Additional complications make it an even shorter timeline. After about 8 generations, you share no more DNA with your ancestors than you do with a random stranger.
Politically this should be more well known. Of course, racists and fascists rely on “blood quantum” arguments to justify racial or ethnic oppression. But they don’t invent this idea of strict genetic identity. It’s latent in the population.
Leftists should more frequently call out genetic tests like 23andMe as inherently racist because it’s based in race science nonsense. It may not be as obvious as Nazis invoking aryan genes or whatever; but it’s still just as incorrect when your aunt at Thanksgiving talks about how she discovered she’s 2% Choctaw or whatever
Yea and the thing is, by 1/4 and 1/100 here, the implied meaning is genealogy ie one’s family tree, which from the posted video is absolutely different from one’s genetics.
From each grandparent, a child receives anywhere between zero and 1/2 of their genes. The only constraint is that the sum of contributions from both grandparents (on one side) is 1/2. That means it is possible to have almost no actual genetic relation with grandma, while bearing a striking similarity to grandpa due to his genes contributing 50% of the child’s DNA.
Blood quantum is on-its-face wrong. We don’t receive 1/4 of each grandparent’s DNA. That is only an average. And of course this doesn’t address the glaring issue of identifying race with genetics.