Sire Gray Smoky Black on dam Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Smoky Black and a mare Black. Equine genetics is a universe of combinations where dominant and recessive alleles determine the final coat of each individual.
On one side, we have the stallion Gray Smoky Black. Genetically, it presents the base genotype E/_ a/a Cr/n G/n. The (G) gene acts on the base coat promoting progressive lightening throughout the horse's life until reaching very pale or completely white tones. This coat is based on Smoky Black.
On the other side, the mare Black contributes with its genetics based on E/_ a/a. Entirely black coat, with no dilutions and no Agouti gene action restricting black pigment to the points.
Quando combinamos esses códigos genéticos, criamos uma matriz de probabilidades. É importante lembrar que o resultado visual (fenótipo) muitas vezes esconde genes recessivos que podem pular uma geração.
The Genotypes Involved
For a horse to have the coat Gray Smoky Black. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a Cr/n G/n, E/e a/a Cr/n G/G, E/E a/a Cr/n G/n, E/E a/a Cr/n G/G.
As for the dam, being Black, may present in its DNA the alleles: E/e a/a, E/E a/a.
Understanding the Alleles
To understand the result of this crossing, note the gene sets at play:
- E/ (Extension - Dominant): The Extension gene controls eumelanin (black) production. At least one E allele allows the horse to have black hairs.
- a/a (Non-Agouti - Recessive): Allows black pigment to spread uniformly across the body. Essential for Solid Black (if E/).
- Cr/n (Heterozygous Cream): One copy of the dilution allele. Lightens red pigment to gold (e.g. Palomino, Buckskin).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Gray Smoky Black with genotype (E/e a/a Cr/n G/n), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Smoky Black with genotype (E/e a/a Cr/n G/G), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Grey allele (G).
Being the sire Gray Smoky Black with genotype (E/E a/a Cr/n G/n), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Smoky Black with genotype (E/E a/a Cr/n G/G), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Grey allele (G).
Being the dam Black with genotype (E/e a/a), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present).
Being the dam Black with genotype (E/E a/a), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray Smoky BlackOpen Coat ➜ 21,9%
Smoky BlackOpen Coat ➜ 21,9%
Gray BlackOpen Coat ➜ 21,9%
BlackOpen Coat ➜ 21,9%
Gray PalominoOpen Coat ➜ 3,1%
PalominoOpen Coat ➜ 3,1%
Gray ChestnutOpen Coat ➜ 3,1%
ChestnutOpen Coat ➜ 3,1%
Want absolute precision?
Genetics is detailed. Knowing whether the animal is Homozygous or Heterozygous completely changes the result. You can run 100% precise simulations by filtering according to the exact genotype of your animal in our App.
Open Rancholi Simulator