"I'd like to share a revelation I've had during my time here. It came to me when I tried to classify your species. I realized that you're not actually mammals. Every mammal on this planet instinctively develops a natural equilibrium with their surrounding environment, but you humans do not. You move to another area, and you multiply, and you multiply, until every natural resource is consumed. The only way you can survive is to spread to another area. There is another organism on this planet that follows the same pattern. Do you know what it is? A virus. Human beings are a disease, a cancer of this planet. You are a plague, and we are the cure." -- Lord Elrond of Rivendell

IDK what came to me but this came to mind:

Let h = human; e = elven

• hh × ee = {he, he, he, he} → all offspring are half-elves

• he × he = {hh, he, he, ee} → 1/4 chance offspring is human, 1/4 chance offspring is elven, 1/2 chance offspring is half-elf

I.. I don't know!! Does the math/genetics check out? Is being elven recessive? I don't know what I'm blabbering about!!

Maybe I'm not understanding the meme here, but I thought Elrond was a full elf because he chose to be when offered the choice (by Eru, maybe?). And his brother chose to be human.

If you don't think too hard about it, the first two alway produce half-elves while the last one can produce a full elf! They just gotta use the correct half.