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Brandybrookes · Mar 29, 2019 10:36 AM

How to know if a stallion or mare is heterozygous or homozygous for a color? Like for instance roan. Theres kitkitr kit r kit r or kit r kit w2 and so on. Is there anyway to tell if a stud or mare will pass on a trait every single time?

Brandybrookes · Mar 29, 2019 10:39 AM

Like a color garuntee just by what shows for genetics like real life horses? Like a horse that will only produce bay or black every time no matter thr mare placed with it?

LEAcres · Mar 29, 2019 10:42 AM

If the horse is homozygous for a gene (kit(r)kit(r)) then it's 100% it'll pass on roan... If it's heterozygous for said gene (kit(r)kit(w2)) it's 50% chance the horse will pass on said gene

Brandybrookes · Mar 29, 2019 10:48 AM

Ok and how would it work for say a bay stallion as i know thats a bit different than roan? Also im assuming KITKITr is also heterozygous?

Heartwood · Mar 29, 2019 10:48 AM

As Bambi said, if it shows two copies of a gene, it is homozygous, and will always pass one of those copies.

With some (like the A genes) it can get a little complex, depending on what you're breeding to. For example breeding a homozygous brown (AtAt) horse to a homozygous bay (AA) horse would result in bay (AtA) foals. This is because At is recessive to A.

Clicking around on the genes and reading their descriptions was (and still is) super helpful to me!

Heartwood · Mar 29, 2019 10:49 AM

If you posted links to the horses you're curious about, that could help :D

Yes, KITKITr is heterozygous roan!

LakeOndowaFarm · Mar 29, 2019 10:52 AM

Homoygous means that both copies of the gene are the same, and the horse will always pass the same thing to its offspring.

Heterozygous means that the genes are different and the horse will pass each allele (version of the gene) 50% of the time.

Here is a sample gene test result. I have made each homozygous gene bold.
EE aa CCcr nd2nd2 gg Ff SSsty Pp KittoKitr SpsSps rbRb WF: Extensive

Brandybrookes · Mar 29, 2019 10:55 AM

Trusty luck
Trusty luck is one of the starting stallions i have.

My goal is to figure out which ones will most deffinant carry certain colors like a stallion that wont produce red factor or one that only produces duns and cremelos and such. Ive been playing around with alot of my horses to see what i get and understand it a little better. Some of the games guides is confusing or doesnt really go into detail for me i guess lol.

Brandybrookes · Mar 29, 2019 11:00 AM

He is AA which is a bay allel but he produced so far 6 red roans . Would another gene factor in like EE in which would change chances in color or if the bay allel factor was aa instead?

Brandybrookes · Mar 29, 2019 11:02 AM

Ok so aa is homozygous over AA and its opposite for ee.

Heartwood · Mar 29, 2019 11:19 AM

I like what Lake Ondowa did with bolding :)

For your guy he is homozygous for the bolded genes:
ee AA CC nd2nd2 gg Ff SS pp KitKitr SpSps IIIi WF: Minimal

As you mentioned above, he is hom (AA) for the bay gene, however bay requires at least one copy of E to express (black on the legs, mane, and tail). Because he is ee, and lacks the necessary E, your stallion is listed as red roan, not bay.

This foal of his did get bay because it inherited an E from the dam:

AQHAR Deep trust

Since Trusty Luck is hom ee, you would have to breed him to mares that are hom EE (for 100% chance of Ee) or het Ee (50% chance of Ee) to get bays.

LakeOndowaFarm · Mar 29, 2019 11:21 AM

I have no idea what you are trying to say in that last post, you seem to be confused about what homozygous means. Homozygous only means that both genes are the same. Both aa and AA are homozygous.

The way that bay works, is that first the horse has to have dominant extension (at least 1 E) in order to be able to create black pigment. If the horse is homozygous recessive extension (ee) like Trusty Luck, then it will be red based (chestnut, red roan, palomino, etc), and the agouti gene has no effect on its color. If it has E then, the agouti gene takes effect determining how much the black is restricted to the points. A is regular bay, and is dominant to a which is black, so E_AA E_Aa or E_aA will all be bay and E_aa will be black.

Brandybrookes · Mar 29, 2019 11:29 AM

Ok thank you, im starting to get it. So a horse thatll throw bays every time would have to be EE AA? And for 50% chance Ee AA.

LakeOndowaFarm · Mar 29, 2019 11:40 AM

An EE AA horse will always throw bay based foals, yes.
The offspring of an Ee AA horse will depend on what it is bred to. If you breed it to EE mates, 100% of the foals will be bay based. If you breed to Ee mates 75% will be bay based (25% EE, 50% Ee) and 25% will be chestnut based. If you breed to ee mates 50% for the foals will be bay based and 50% will be chestnut based. The same pattern of inheritance also applies if your horse is EE Aa with the options for foals being bay vs black instead of bay vs chestnut.

Brandybrookes · Mar 29, 2019 11:57 AM

Ok thank you . Ive been attempting to figure this out all week.

Brandybrookes · Mar 29, 2019 11:57 AM

:)

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