A Czechoslovakian study on incest showed that children born to first-degree related parents (siblings, parent - child) were 40 to 50 percent more likely to have severe genetic birth defects (hemophilia, congenital organ failure, congenital blindness, etc.)
https://www.psychologytoday.com/blog/animals-and-us/201210/the-problem-incest
If this was a donated egg, then Mom would be the "oven" but it wouldn't be her "bun" genetically speaking, right?
But, I wonder if the genes of the surrogate mother don't somehow "seep" into the fetus. I mean, she has to have some sort of hookup to feed it, right?
I suppose the scientists say "no" but it seems odd that it doesn't.
Meet the poster boy for inbreeding.
http://scienceblogs.com/notrocketscience/2009/04/14/how-inbreeding-killed-off-a-line-of-kings/