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singergirl · Mar 20, 2018 6:33 PM

I have mare who's dominant homozygous cream (CC) and dominant homozygous sooty (SS) but she looks like this

Garland Crown

So is the CC masking the SS genes?

ObsidianKitsune · Mar 20, 2018 6:37 PM

Not at all. Your horse doesn't have any cream at all, which is denoted as Ccr. Nor does your horse have sooty, which is Ssty.

singergirl · Mar 20, 2018 7:13 PM

Oh! the genetics guide doesn't say anything about how it looks like when coded like that. So is CC and SS the homozygous recessive symbols for cream and sooty? and to clarify Ccr and Ssty is dominant homozygous for these two genes?

ObsidianKitsune · Mar 20, 2018 7:33 PM

Ccr and Ssty are the dominant notations for those genes. You can also get Cprl, which is pearl, and S+, which is called sooty +. They occur at the same place and can interact with each other. Let me get examples.

ObsidianKitsune · Mar 20, 2018 7:37 PM

Hom cream, chestnut base (name can change based on base):

KC 447935

Het cream, het pearl on chestnut base:

SP Winter Memory PC

Hom pearl silver bay base:

KT6 Piv464983

singergirl · Mar 20, 2018 8:17 PM

Interesting! My thinking was that the SS and CC genes were dominant making her coat lighter than the bay shown in pictures in the breeding guide. I see now that the lighter color might be because she is a silver bay with Ee.

FallenShadows714 · Mar 20, 2018 8:21 PM

She doesn’t carry the silver gene (Z) in her genes at all. She’s just a classic bay. The E is Extension, and causes black base horses when present as a dominant, whether heterozygous or homozygous.

ObsidianKitsune · Mar 20, 2018 8:21 PM

It's not that either! She's just a normal classic bay. There are some variations between the colours.

To be silver, the horse needs a "Z", either Zz or ZZ. And the E is completely dominant over the e, so it being heterozygous (only one copy) doesn't matter at all.

RoseFlute · Mar 20, 2018 8:22 PM

no, she's lighter because the sooty she doesn't have would make her darker. She isn't silver, or she'd have a Z in there. :) Also, heterozygous E doesn't affect shading at all, it's just a toggle switch between black base and red base. :)

RoseFlute · Mar 20, 2018 8:23 PM

Or we could all just let Obsidian handle it instead of tackling the new people. XD

FallenShadows714 · Mar 20, 2018 8:25 PM

Haha we did all post at the same time! Whoops!

ObsidianKitsune · Mar 20, 2018 8:26 PM

Here are some other horses roughly the same colour (and genotype) as your girl:

Edale Hope

mia5555555555

beou

As the E is dominant over the e, the A is dominant over At and a. The A is also what causes the horse to be bay. If the horse had aa instead, coupled with an E, they'd be black.

ObsidianKitsune · Mar 20, 2018 8:27 PM

It's fine, I don't mind the help people lol.

singergirl · Mar 21, 2018 2:19 PM

Ok, I get it now. The pictures in the genetics guide really got me confused. Thanks for all the help!

pfrsue · Mar 25, 2018 4:18 PM

And just to help clarify, this is a silver bay. He's homozygous for both silver and sooty.

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