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Post by Snowfrost on Aug 13, 2011 3:13:04 GMT -5
Well, even though I gave you all a pretty in-depth analysis of the agouti in the first thread, for organization's sake I'll explain it again here (in a simpler manner, since I don't need to go over 'shade modifiers' again!).
The second type of true base color, red, is caused by the agouti gene 'A'. This Allele restricts black pigment in a horse's coat (on black-based horses, only, since chestnuts have no black on them!). There's not much of a change between a heterozygous and homozygous pair of agouti, but when you add your agouti alleles you'll obviously get changes in shade (and sometimes color). Remember A + a t? Yep, those are the ones I'm referring to!
Now, a horse with aa for their agouti simply means that it will be the recessive to its partner when mating -- so say if a mare had 'aa' and bred to a stallion with 'Ee' (heterozygous black), the only thing that would show up on the foal would be 'Ee' (black). Her color would have no 'say' in the matter.
Now, there is an exception to this gene. When considering 'black chestnuts', or extremely dark liver chestnuts, there is a present (but recessive) 'e' (extension) on the code. Instead of the 'A' being present, it is replaced with a lowercase 'e'. Now, the 'shade modifiers' can still be used on them, but they will be portrayed on the small e.
eea | ee+ | eeA | eet*** Remember, flaxen will still work here, and silver still will not show up on this color. It acts just as a chestnut, because, in essence, it is!
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