First of all, I think that Ivorwen has a little too much free time to spend pondering hereditary ear-shape. Second, it would depend which characteristic would be the recessive gene and which would be the dominant. Then it would depend on which gene would be passed on from each parent. But also, if Aragorn has elvish blood in him, then he would have more than zero pointy-ear genes.
Semi-pointy ears?
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I sit beside the fire and think of people long ago,
And people who will see a world that I shall never know.
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