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...I really don't here - control genes -RANT (2) |
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u]Control genes rant - part 2 - specifically, inhibiting control genes.
So, I finally feel rantish again.
Anyways, in the screwy genetics rant, part one, I said 'or you can just blame it on a control gene'.
There's two different types of control gene.
An 'expressing control gene' and an 'inhibiting control gene'
In this particular rant, we will only deal with inhibiting control genes...that's why it's part two.
Okay, so dear Susquehanna simply must have different-coloured eyes, despite both of her parents having the same coloured eyes?
Fine.
Let me show you a way to do it (hopefully), without people screaming at you.
In this case, we'll use I for the allele that says 'don't allow trait to express itself' and i for the allele that says 'allow trait to express itself'.
As before, the trait is Heterochromia Iridis or speshful eyes of different colours!
Okay, so let's meet her parents - *consults clipboard* Crystal-Twilight and Storm-Blade, here they are!
Now, as you can see, neither have different-coloured eyes.
However, they are both hetrozygous for Heterochromia Iridis (i.e. they both have a H and a h)
So what happened?
Simple. CT and SB are both HhIi
If you do a punnet square, you can see that the possible outcomes are HHII, HHIi, HHIi, HHii, HhII, HhIi, HhIi, Hhii, HhII, HhIi, HhIi, Hhii, hhII, hhIi, hhIi, hhii.
Susquehanna has either Hhii or HHii and thus, she has a legitimate scientific reason for having different-coloured eyes, even though her parents don't.
 Firlodge · Wed Jan 23, 2008 @ 04:33pm · 2 Comments |
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