Sire Grullo on dam Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Grullo 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 Grullo. Genetically, it presents the base genotype 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.
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 Grullo. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a D/n, E/e a/a D/D, E/E a/a D/n, E/E a/a D/D.
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/).
- D/ (Dun - Primitive Gene): Dilutes body color and adds dorsal stripe and leg barring.
Calculated Probabilities
Being the sire 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 sire 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 sire 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 sire 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).
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:
GrulloOpen Coat ➜ 43,9%
BlackOpen Coat ➜ 43,9%
Dun ChestnutOpen Coat ➜ 6,1%
ChestnutOpen Coat ➜ 6,1%
Want absolute precision?
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