Sire Smoky Black on dam Grullo
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Smoky Black and a mare Grullo. 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 Grullo contributes with its genetics based on E/_ a/a D/n. The Dun gene acts on the base color, adding the characteristic dark dorsal stripe. In some cases it lightens the body tone and may also produce zebra-like leg markings. This coat is based on Black.
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 Grullo, may present in its DNA the alleles: E/e a/a D/n, E/e a/a D/D, E/E a/a D/n, E/E a/a D/D.
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).
- D/ (Dun - Primitive Gene): Dilutes body color and adds dorsal stripe and leg barring.
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 Grullo with genotype (E/e a/a D/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 primitive Dun allele (D).
Being the dam Grullo with genotype (E/e a/a D/D), 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 primitive Dun allele (D).
Being the dam Grullo with genotype (E/E a/a D/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 primitive Dun allele (D).
Being the dam Grullo with genotype (E/E a/a D/D), 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 primitive Dun allele (D).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Dun Smoky BlackOpen Coat ➜ 21,9%
Smoky BlackOpen Coat ➜ 21,9%
GrulloOpen Coat ➜ 21,9%
BlackOpen Coat ➜ 21,9%
Dun PalominoOpen Coat ➜ 3,1%
PalominoOpen Coat ➜ 3,1%
Dun ChestnutOpen Coat ➜ 3,1%
ChestnutOpen Coat ➜ 3,1%
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