Not sure what this means, because I'm pretty sure kids inherit their parents's genes, no matter who their parents are.
Or neither...like when beautiful parents have ugly children, or when ugly parents have beautiful children. Can't predict the outcome, unless you're cooking the DNA.
I personally don't care who anyone marries or makes babies with, but I freely admit that it's one of my pet peeves, when people pretend (or even really believe) that they're only having mixed race children, to save the species, or to create a master race.
First of all, we've been creating mixed race children, for as long as there have been races, and for as long as the races have been encountering each other, and we haven't created a master race, yet...
...and Secondly, I'm pretty sure that creating a master race is something we shouldn't even be trying to do...for a variety of reasons.
Have children with whomever you choose and whomever chooses you, but kids don't need the kind of pressure and mind fuuck that's sure to accompany the expectation that they're some sort of genetic supreme beings(science experiments). In fact, that's a big part of the race-obsession problem we already have...