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This main character was genetically created by an alien species.

This particular alien specie are highly intelligent and have numerous abilities such as telepathy, defensive powers similar to magic and can change/morph into any living thing. I wanted to add a certain twist to my main character that makes her different than aliens but have something about her that could change or transition like the alien kind could do.

Before deciding on an ability, I wanted to see if this is even possible for the specie to genetically modify and create her to do this.

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    $\begingroup$ Certainly, chameleons here on Earth change color according to their mood. $\endgroup$
    – kylieCatt
    Jul 25 '15 at 19:49
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    $\begingroup$ Isn't this a standard Mary Sue trait? $\endgroup$
    – Obie 2.0
    Jul 26 '15 at 2:04
  • $\begingroup$ I haven't heard of "Mary Sue". I'll look into it. Thank you. $\endgroup$
    – Meesa26
    Jul 26 '15 at 6:39
  • $\begingroup$ Take a look at this: tvtropes.org/pmwiki/pmwiki.php/Main/KaleidoscopeEyes. $\endgroup$
    – Obie 2.0
    Jul 26 '15 at 18:47
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Splicing genes for certain traits is common now, specifically with food.

the main concerns with this for humans are ethical.. You could play around with that idea...

But the actually ability is possible. Now how it will interact with moods.. that part hasn't been discovered. However moods like anger affect adrenaline which has effects on skin flushing and heart rate, so it would be a matter of someone figuring out the biochemical changes and figuring how to do 'eye color' change meets 'mood emotional indicators' and linking them.

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The idea of a human-alien hybrid takes you far beyond scientific plausibility, so "genetically" and "possible" don't really apply.

  • Mules are hybrids between horses and donkeys, and they're sterile. That's despite the fact that horses and donkeys are from the same kingdom, phylom, class, order, family and genus.
  • Same for most Ligers.

You can't even be sure that the aliens use the same amino acids or the same chirality. So you're left with the magic explanation unless you're prepared to fiddle with the evolutionary history of Earth.

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  • $\begingroup$ Ligers are not sterile. For all cat hybrids, females are fertile and while yes most males can't reproduce, it is not because they are sterile. Some males however are fertile so you could get liger x tigon hybrids(which I don't know what it would be called(litigoner maybe(li for male liger, tigon for female tigon, and er to emphasize that it is a male liger, not a male lion. $\endgroup$
    – Caters
    May 4 '16 at 18:18
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It sounds like eyes changing with moods is the least of your problems with plausibility. Magic and telepathy already put this story solidly in the realm of fantasy rather than science fiction, so you don't need a scientific explanation.

However, if you want a scientifically plausible creature whose eyes change color rapidly (regardless of the trigger), I would recommend them having chromatophores in their irises. Chromatophores are the kind of cells that allow cephalopods such as octopus, squid and cuttlefish to change color, and they can change at a moment's notice.

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