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Are there any genes that do NOT halve over succesive human generations? Sort of an uber-dominant gene?

Note: I asked this question in the science section so that it would get noticed by those who actually know lots about genetics, not how to write a story, which is what the answer to this question will be used for. I plan to use this idea for a fantasy series. It will be a gene that makes it so that the ruling class have a stronger potential for magical ability and prowess then the average citizen. Not that I mean to constrain fantasy to an entirely realistic premise, of course. It just helps to have a basically logical premise for a story, given that a magical realm works differently than ours.

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I'm a bit confused on te question alltogether but to make sure I cover what you're asking I'll put this two ways. You can have less than half your genes the same. Like if your dad has te genes rr and mom has rR. It is also possible that bad genes continue. Ican only think of the typical extra fingers example.. you're also writing a book about magic so.. why do you need scoence

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A logical premise doesn't hurt, even in fantasy books, as I put in the description. I was asking if there is a gene that doesn't get weaker (watered down by halving) over generations.
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red heads... V.V

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Red heads are a recessive gene...
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are they? seems pretty dominate in my family >.< my bad tho!
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That's what i thought.
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Unless the gene in question has mutated to the point that it cannot halve over successful generations, there are no known normal genes that behave in this manner. You can get more information at http://learn.genetics.utah.edu/ and http://biology.about.com/od/basicgenetics/a/aa071705a.htm.

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Thank you for the answer and links!
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