It’s not like putting milk in coffee. They don’t all come out exactly the same color. Have you ever seen real people?
For quantitative traits that are controlled by many genes of small effect, it’s more like mixing paint. Stature, probably skin pigmentation.
Quantitative trait locus - Wikipedia
Whereas traits controlled by a single locus are not like mixing paint, they follow a Mendelian pattern of inheritance. Blood type, eye color.
Why are you in a mixed-race marriage if you think the races should be kept separate “to preserve diversity.” ( 
)
Or is it only Black-White couples that you think should not be allowed?
Where did I say that I thought diversity “should” be preserved? Where did I say anything “should” be attained or preserved?
Current conventional wisdom is that diversity is a good thing. OK, fine. When you want diversity, and you have it, how do you plan to preserve what you think is a good thing? Racist social engineering? Do what you please, I’m just watching.
In case you all haven’t figured it out, jtur thinks that he has a clever gotcha and that people who like diversity are actually hypocrites because somehow diversity ultimately makes things less diverse. Something like that.
Or not…
There are a very large number of loci involved in skin pigmentation, to the extent that it’s treated as a classic example of a quantitative trait. That doesn’t mean it’s literally like mixing paint, where a child will always fall exactly halfway between the parents. The genetics are complex, and the existence of unusual cases like the kids above doesn’t refute the general principle. If humans interbreed randomly with respect to parental skin pigmentation, there will be a general trend toward intermediate pigmentation, i.e. variance in pigmentation will decrease.
Then don’t agree with someone who’s saying it is (even if, I suspect, they’re saying it sarcastically)
I agreed with the analogy because as a first approximation some traits are more like mixing paint than Mendelian inheritance.
I was being sarcastic, yes.
I don’t think it’s all that good even as a first approximation. I’ve seen a lot of families where the kids have significantly different skin colors. Similarly, I’ve seen full siblings one of whom looks “east Asian” to me and the other who whom doesn’t. The first time I noticed that was in college, when my (Chinese-American) roommate’s cousin visited, and I was surprised when I saw her, because she was “white”.
As pointed out, we’ll have plenty of ethnic and cultural diversity, as well as economic, political, and every other kind. If (somehow) all people were the same shade of brown, I’m sure we’d adjust just fine. I can’t really imagine that happening in the next 15 to 20 generations, but who knows. In the meantime, we celebrate diversity and put our worries about a dark beige sea of humanity on the back burner for a few hundred years.
That same shade of tan has pretty much happened already in Brazil, and it took only about two generations. The same two generations since I couldn’t understand anyone in my grandfather’s local store – we had plenty of cultural diversity then, but didn’t appreciate it.
200 years is a long time. 200 years ago, a majority of the world’s people had never seen a single human being from a different culture, let alone a different race. And those they saw were conquerors. Now there are people alive who have seen a whole pendulum swing. My wife grew up barefoot in the jungle, never imagining water taps or electric lights. The change will be dizzying even in 20 years. We have already entered an era of social engineering.
There are a lot of tan people in Brazil. There are also a lot of dark and light Brazilians.
I read an interesting paper about Brazil a while back (2003)
https://www.pnas.org/content/100/1/177.full
“Our data suggest that in Brazil, at an individual level, color, as determined by physical evaluation, is a poor predictor of genomic African ancestry, estimated by molecular markers.”
So there is a wide range of color variation - but you can’t tell ancestry very well by looking at someone’s skin
Brazilians:
@jtur88 be like:
Same in California. I had two co-workers who were both natural redheads and very white who married Mexican American guys. One woman’s kids were all very light and even had the reddish hair. We’d tease her about her “strong” genes.
I “toured” German Village decades ago when it was first a designated “historic” area. My mom’s family moved up to Columbus from Murray City when she was 7, and they lived in the German Town area.
I’m ignoring jtur88. I wish I were more “brownish.”
So again, if you are so concerned about interracial couples causing the death of diversity, why did you, a white American, marry a Filipino women who “grew up in the jungle?”
Those are actors and models selected by a casting agency to reflect what some PR firm wishes Brazilians looked like. There are no fat, old Brazilians with imperfect teeth?