Loading…
Predict horse coat color probabilities from sire and dam base colors and genes — scientifically grounded inheritance.
Predict horse coat color probabilities from sire and dam base colors and genes — scientifically grounded inheritance.
Enter values above and click Calculate — results will appear here with the formula explained.
Base coat is controlled by Extension (E/e) and Agouti (A/a). Chestnut is recessive e/e, black is E/_ with a/a, bay is E/_ with A/_ . Gray (G) is dominant and lightens any base over time. Cream (Cr) dilutes: one copy on bay = buckskin, on chestnut = palomino, on black = smoky black; two copies = perlino, cremello, smoky cream.
This calculator uses scientifically defensible Mendelian probabilities for these three well-understood genes. Other genes (dun, silver, champagne, etc.) are not modeled and can modify. Architecture is extensible for other animal coat genetics by adding loci.
Predict horse coat color probabilities from sire and dam base colors and genes — scientifically grounded inheritance. Formula: Extension E/e and Agouti A/a determine base: e/e = chestnut, E/_ a/a = black, E/_ A/_ = bay.
Base coat is controlled by Extension (E/e) and Agouti (A/a). Chestnut is recessive e/e, black is E/_ with a/a, bay is E/_ with A/_ . Gray (G) is dominant and lightens any base over time. Cream (Cr) dilutes: one copy on bay = buckskin, on chestnut = palomino, on black = smoky black; two copies = perlino, cremello, smoky cream.
This calculator uses scientifically defensible Mendelian probabilities for these three well-understood genes. Other genes (dun, silver, champagne, etc.) are not modeled and can modify. Architecture is extensible for other animal coat genetics by adding loci.
Bay sire (E/_ A/_) × chestnut dam (e/e a/a): 50% bay, 50% chestnut for base; plus gray/cream if parents carry. Bay × black gives 75% bay/black, 25% chestnut etc.
Formulas are standard public references (see our methodology). External standards are cited in the text where they apply.
New tool — content being expanded · Report an error