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Question regarding RL tobiano gene
  • Sankt wendelSankt wendel
    MessagePosts: 273
    Hello everyone!
    I would love some help here...

    I am aware that tobiano is a dominant gene and linkage with the extension locus can occur. Could linkage be the reason why people say a certain tobiano stallion sires 75% tobiano foals? I don't have the information whether those tobiano foals are black based (as their sire is). Thanks in advance!
    Post edited by Sankt wendel at 2024-11-26 12:47:19
  • annismyrphannismyrph
    MessagePosts: 8,593
    following
    Anni9

    image
  • GoldenHeartAcresGoldenHeartAcres
    MessagePosts: 1,691
    I don’t believe it is. Tobiano inheritance is still 50% if the horse is heterozygous. Each pairing is a flip of a coin as to whether the foal will inherit tobiano or not. If they do, they will also likely inherit the linked extension gene. When a breeder says 75% of the foals have been tobiano, it just means that out of every individual coin toss for inheritance, the coin landed heads up for tobiano 75% of those times.
    IMG-0214
    Formerly AlAsseelStable
    Thanked by 1Sankt wendel
  • AmmitAmmit
    MessagePosts: 11,691
    Linkage controls how often two genes are inherited together not how often a gene is inherited at all. We have tobiano linkage in the game.

    Take this example horse

    image
    LG2 Moon by Midnight

    His e gene is linked to roan and his E is linked to tobiano.

    Every single one of his red foals are roan. The single red tobi he sired is from a mare with tobiano herself.
    Need to contact me? Read this first.

    I sometimes get busy and miss things. If your private message, question, etc. gets missed please ping me so I can follow up with you. I am also always happy to explain or clarify. (HAJ does not have a customer service email, please send me a forum message! )

    she/her


    image
    Thanked by 2Sankt wendel ChateauAlbere
  • Sankt wendelSankt wendel
    MessagePosts: 273
    Isn't this game pure perfection? :x
  • Sankt wendelSankt wendel
    MessagePosts: 273
    Genotype of the stallion: Ee Aa KIT To KIT to (bay tobiano)
    Phenotype of descendants:
    66 foals total

    46% bay tobianos
    13.16% black tobianos
    13.16% chestnut
    23.68% bay
    3.95% black

    Since 59.16% of his foals are black based tobianos, 0% red based tobianos, then:
    E is linked to KIT To
    e is linked to KIT to

    and 27.63% black based without tobiano gene foals could be the outcome of crossing over;

    Right?

  • AmmitAmmit
    MessagePosts: 11,691
    You are forgetting that the dam can also contribute a black gene.
    Need to contact me? Read this first.

    I sometimes get busy and miss things. If your private message, question, etc. gets missed please ping me so I can follow up with you. I am also always happy to explain or clarify. (HAJ does not have a customer service email, please send me a forum message! )

    she/her


    image
    Thanked by 1GoldenHeartAcres
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