Sire Dun Smoky Cream on dam Smoky Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Dun Smoky Cream and a mare Smoky 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 Dun Smoky Cream. Genetically, it presents the base genotype E/_ a/a Cr/Cr 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 Smoky Cream.
On the other side, the mare Smoky Black contributes with its genetics based on E/_ a/a Cr/n. Slightly faded black coat caused by a single copy of the cream gene over the black base.
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 Dun Smoky Cream. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a Cr/Cr D/n, E/e a/a Cr/Cr D/D, E/E a/a Cr/Cr D/n, E/E a/a Cr/Cr D/D.
As for the dam, being Smoky Black, may present in its DNA the alleles: E/e a/a Cr/n, E/E a/a Cr/n.
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).
- D/ (Dun - Primitive Gene): Dilutes body color and adds dorsal stripe and leg barring.
Calculated Probabilities
Being the sire Dun Smoky Cream with genotype (E/e a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/e a/a Cr/Cr 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 Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/E a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/E a/a Cr/Cr 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 Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the dam 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 dam 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).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Dun Smoky CreamOpen Coat ➜ 21,9%
Smoky CreamOpen Coat ➜ 21,9%
Dun Smoky BlackOpen Coat ➜ 21,9%
Smoky BlackOpen Coat ➜ 21,9%
Dun CremelloOpen Coat ➜ 3,1%
CremelloOpen Coat ➜ 3,1%
Dun PalominoOpen Coat ➜ 3,1%
PalominoOpen Coat ➜ 3,1%
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