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Genetics question
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    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?
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    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?
  • LEAcresLEAcres
    MessagePosts: 3,873
    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
    Post edited by LEAcres at 2019-03-29 10:42:23
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    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?
  • HeartwoodHeartwood
    MessagePosts: 1,223
    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!
    ID: 247225
    she/her
    DP & Dapples
    Collector of tall, dark dappled riding horses in all shades.

  • HeartwoodHeartwood
    MessagePosts: 1,223
    If you posted links to the horses you're curious about, that could help :D

    Yes, KITKITr is heterozygous roan!
    ID: 247225
    she/her
    DP & Dapples
    Collector of tall, dark dappled riding horses in all shades.

  • LakeOndowaFarmLakeOndowaFarm
    MessagePosts: 12,441
    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
    Breeding high quality Sheldasen horses in all the fancy colors.
    81995
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    image
    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.
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    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?
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    Ok so aa is homozygous over AA and its opposite for ee.
  • HeartwoodHeartwood
    MessagePosts: 1,223
    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:
    image
    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.

    Post edited by Heartwood at 2019-03-29 11:23:37
    ID: 247225
    she/her
    DP & Dapples
    Collector of tall, dark dappled riding horses in all shades.

  • LakeOndowaFarmLakeOndowaFarm
    MessagePosts: 12,441
    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.
    Breeding high quality Sheldasen horses in all the fancy colors.
    81995
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    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.
  • LakeOndowaFarmLakeOndowaFarm
    MessagePosts: 12,441
    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.
    Post edited by LakeOndowaFarm at 2019-03-29 11:41:36
    Breeding high quality Sheldasen horses in all the fancy colors.
    81995
    Thanked by 1ConfluenceStable
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    Ok thank you . Ive been attempting to figure this out all week.
  • BrandybrookesBrandybrookes
    MessagePosts: 1,308
    :)
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