Actually, it is clear that siblings share slightly more than 50%. This doesn’t have to do with any fancy issues involving strange things in recombination. They have identical mitochondrial DNA.
So are half-siblings with the same mother more closely related than half-siblings with the same father? Or cousins with mothers who are sisters rather than mothers who are sisters-in-law?
Actually, it is clear that siblings share slightly more than 50%. This doesn’t have to do with any fancy issues involving strange things in recombination. They have identical mitochondrial DNA.
So are half-siblings with the same mother more closely related than half-siblings with the same father? Or cousins with mothers who are sisters rather than mothers who are sisters-in-law?
Yes, But this is very rarely relevant because the active part of mitochondrial DNA is almost identical for almost all humans.