Sire Smoky Black on dam Gray Smoky Cream
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Smoky Black and a mare Gray Smoky Cream. 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 Smoky Black. Genetically, it presents the base genotype E/_ a/a Cr/n. Slightly faded black coat caused by a single copy of the cream gene over the black base.
On the other side, the mare Gray Smoky Cream contributes with its genetics based on E/_ a/a Cr/Cr 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 Cream.
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 Smoky Black. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a Cr/n, E/E a/a Cr/n.
As for the dam, being Gray Smoky Cream, may present in its DNA the alleles: E/e a/a Cr/Cr G/n, E/e a/a Cr/Cr G/G, E/E a/a Cr/Cr G/n, E/E a/a Cr/Cr G/G.
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).
- Cr/Cr (Double Cream): Maximum dilution. Pink skin, blue eyes (e.g. Cremello, Perlino).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Smoky Black with genotype (E/e a/a Cr/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).
Being the sire Smoky Black with genotype (E/E a/a Cr/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).
Being the dam Gray Smoky Cream with genotype (E/e a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Grey allele (G).
Being the dam Gray Smoky Cream with genotype (E/e a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and always transmits the Grey allele (G).
Being the dam Gray Smoky Cream with genotype (E/E a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Grey allele (G).
Being the dam Gray Smoky Cream with genotype (E/E a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and always transmits the Grey allele (G).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray Smoky CreamOpen Coat ➜ 21,9%
Smoky CreamOpen Coat ➜ 21,9%
Gray Smoky BlackOpen Coat ➜ 21,9%
Smoky BlackOpen Coat ➜ 21,9%
Gray CremelloOpen Coat ➜ 3,1%
CremelloOpen Coat ➜ 3,1%
Gray PalominoOpen Coat ➜ 3,1%
PalominoOpen Coat ➜ 3,1%
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