Color Question

[kane1598]

What are the color possibilities of a blue roan cow and a red roan bull? and the possibilities of a blue roan cow and a red bull?

 

[frostback]

Blue roan to a Red roan
25% black calf
25% blue roan
25% red roan
25% white

Blue roan to a Red
50% black calf
50% red roan

 

[kane1598]

thanks alot

 

[Ms Ray]

Why is there no possibility  of a roan when you breed with a red?
So does that mean a blue roan cow to a black a bull you would get a black?

 

[frostback]

Re read my post there is a 50% chance of a red ROAN

Blue roan to a homo Black
50% homo black
50% blue roan

Blue roan to a hetro Black
25% homo black
25% hetro black
25% blue roan
25% red roan

 

[hntwhitetail]

What about red roan to a black?  Be pretty much the same correct?  Except for a homo black you would have 50% red roan?

 

[frostback]

Red roan to Homo black
50% hetro black
50% blue roan

Red roan to a Hetro black
25% hetro black
25% red
25% blue roan
25% red roan

 

[JSchroeder]

Blue roan to a Red
50% black calf
50% red roan

Shouldn't that be...

25% Blue Roan
25% Red Roan
25% Black
25% Red

 

[frostback]

No its what I put. Each parent only gives one colour gene to the calf, so when one animal only has a red gene to give you cannot get the blue roan. Also the blue roan animal does not have a red gene to give you cannot have a red offspring. Make sense?

 

[JSchroeder]

No, it doesn't.  The roaning and extension genes are two different genes.

The calf would have a 50/50 shot at being black (assuming hetero on the blue roan) and 50/50 on being roan.  Thus the 25/25/25/25 split.

 

[frostback]

No, it doesn't.  The roaning and extension genes are two different genes.

The calf would have a 50/50 shot at being black (assuming hetero on the blue roan) and 50/50 on being roan.  Thus the 25/25/25/25 split.

What do you mean by hetro on the blue?

 

[Okotoks]

No, it doesn't.  The roaning and extension genes are two different genes.

The calf would have a 50/50 shot at being black (assuming hetero on the blue roan) and 50/50 on being roan.  Thus the 25/25/25/25 split.

The roan color is the result of the white gene bing paired with either the black or roan gene. The amount of roaning can vary greatly but there is no way to get a blue roan from a mating with a red animal. Some roans appear solid colored the only roaning being in their tail , brisket or inside of the hind legs. They still carry the white gene. The blue roan animal can only givie a white gene or black gene.
The roan color in Shorthorns is often used as an example of co-dominance in genetics courses.

 

[Okotoks]

Some stuff you can google on codominance. Roan color.

Roan Cattle
The roan colour can also result in Shorthorn Cattle, but in a case of intermediate inheritance or Codominance. These cattle can not breed true, as this type of intermediate inheritance is also Heterozygous, or hybrid, as two different colour alleles are required form the parents to produce this particular coat coloring.
Breeds of cattle known for roans are the Belgian Blue and Shorthorn. Among the former, coat color may be solid black, solid white, or blue roan; the latter may be solid red, solid white, or red roan. Belgian Blues also typically exhibit spotting patterns,[11] which are genetically separate from roan. As a result, most roan cows exhibit blotches of clearly colored and clearly white hair, with roan patches.[12] Some "cryptic" roan cattle appear solid, but upon close inspection reveal a small roan patch.[13] Roan cattle cannot "breed true" but breeding white cattle to a solid mate will always yield a roan calf. The white color typical of Charolais and White Park breeds is not related to roan.[13]
Roan in Shorthorns and Belgian Blues is controlled by the mast cell growth factor (MGF) gene, also called the steel locus, on bovine chromosome 5.[14] Part of the KIT ligand, this region is involved in many cell differentiation processes. Mast cell growth factor promotes pigment production by pigment cells,[15] and without it, skin and hair cells lack pigment. With two functional MGF genes (homozygous dominant), cattle are fully-pigmented; without any functional MGF genes (homozygous recessive), they are white. MGF-controlled roan occurs when cattle possess one functional and one non-functional MGF gene (heterozygous), resulting in a roughly even mixture of white regions and colored regions.[13]
Codominance
From Wikipedia, the free encyclopedia
Codominance refers to a relationship between two alleles of a gene. It occurs when the contributions of both alleles are visible in the phenotype.
For instance, in the ABO system, the IA and IB alleles are co-dominant in producing the AB blood group phenotype, in which both A- and B-type antigens are made. Another example occurs at the locus for the Beta-globin component of hemoglobin, where the three molecular phenotypes of HbA/HbA, HbA/HbS, and HbS/HbS are all equally detectable by protein electrophoresis. (The medical condition produced by the heterozygous genotype is called an incomplete dominant, see above). For most gene loci at the molecular level, both alleles are expressed co-dominantly, because both are transcribed into RNA.
Co-dominance and incomplete or semi-dominance are not the same thing. For example, in some plant species, pink flowers may be the product of a mixture of red and white pigments (co-dominance on the pigment level, no dominance on the color level), or the result of one allele that produces the usual amount of red pigment and another non-functional allele that produces no pigment, so as to produce a dilute, intermediate pink color (no dominance at either level).

 

[ai er]

But what about the red and white spotted or black and white spotted ones that you'll get?

 

[JSchroeder]

Hetero black as on the difference between red and blue roan.

 

[frostback]

But what about the red and white spotted or black and white spotted ones that you'll get?

That is a whole other can or worms. Colour is only two genes, one from both parents.
Now,, yes you can get spotting or markings with these matings also. Face white, body white, socks, and belly are all different genes.

 

[frostback]

Hetero black as on the difference between red and blue roan.

I still dont understand what you are getting at. Are you saying the blue roan carriers a red gene?

 

[JSchroeder]

Yes, a blue roan can carry a red gene.

 

[Okotoks]

Yes, a blue roan can carry a red gene.

No a blue roan cannot carry a red gene. By definition if it is blue roan it carries a black gene and a white gene and due to codominnce the animal is a blue roan. Each animal only gets one color gene from each parent, they can't get three!

 

[JSchroeder]

Where exactly did you come up with that?

Black (extension) and roaning (what you seem to be calling white) are two completely different genes.