• About This Guide
  
• How This Guide is Being Developed
  
• Philosophy of this guide
  
• Using this Guide
  
• Thinking Scientifically
  
• About the Author
  
• Documented Genes
  
• What is a documented gene?
  
• Black/Red (MC1R)
  
• Bay (ASIP)
  
• Cream/Pearl (SLC45A2)
  
• Dun (TBX3)
  
• Gray (STX17)
  
• Silver (PMEL17)
  
• Champagne (SLC36A1)
  
• Roan/Tobiano/Sabino/White Spotting (KIT)
  
• Splash White (MITF/PAX3)
  
• Leopard Complex (TRPM1/ECA3P)
  
• Frame (EDNRB)
  
• Tiger Eye (SLC24A5)
  
• Height Regulation (HMGA2/LCORL)
  
• Mushroom (MFSD12)
  
• Hypothetical Genes
  
• What is a hypothetical gene?
  
• Borrowed Genes
  
• Glossaries
  
• Glossary of Colors
  
• Glossary of Terms
  

About the Author

• Last updated: 2026-01-14

  This guide is written by Ellie Akers, also known as Ammit, the creator of HorseGeneticsGame.com. Ellie is a well educated lay person but not a geneticist. Ellie started her first genetic experiments in 4th grade by breeding a population of purple striped starflowers from all white original stock, in her backyard. Once she learned about horse genetics young Ellie was hard at work organizing her toy horses into genetically plausible families.  Ellie has been studying horse genetics as a hobby for over 30 years and has studied inheritance first hand while breeding horses, goats, ducks, chickens, and of course plants.