Genetics question

whirlybird · 11-01-2003, 12:23 PM

My horse is 1/2 paint 1/2 TB... the sire is a tabiano and the dam is almost black. My horse has black mane and tail, pretty dark bay coloring with two white socks and a white blaze... there are a couple small (half dollar size) black spots on her socks. Do you think that she might throw a tri-colored paint in the future?

Just wondering....

monica-n-shiloh · 11-01-2003, 12:27 PM

it depends on the sire's coloring did he have alot of black?? I took genetics last semester in school and it was pretty cool. I'd say yeah there might be a possibility that she could have a tri-color if the sire wasnt black, but I cant really tell from ur info.

Dawn · 11-01-2003, 12:49 PM

Well it depends on what you breed her to. The only way you're even guarenteed a coloured baby is if you breed her to a homozygous stud. If you breed her to a heterozygous stud, you'll have a 75% chance of a coloured baby. And if you breed her to a non-coloured stud, you have a 50% chance. Now seeing that she's not a tri-colour, I have no idea on what her chances are of a tri-coloured baby. It would all depend on the stud.

monica-n-shiloh · 11-01-2003, 12:50 PM

another genetics babe...lol

go dawn! haha
that was the other big thing i forgot to mention..it depends on who u breed her to..duh to me lol.

scatterbrain I am...

sportpony · 11-02-2003, 06:51 AM

If the sire is tobiano and her mare is bay with stockings but no body white, she does not carry the tobiano gene so she cannot produce a paint unless she is bred to a stallion who is one. Tobiano is dominant so it is one of those "what you see is what you get". If she does not have tobiano characteristics she is not tobiano and can't produce it. It is not one of the recessives that can be hidden and not expressed.

To get tobiano from her you would have to breed to a homozygous tobiano stallion. This would guarantee you a tobiano foal, since the stallion would carry two copies of the tobiano gene and would always pass one of those on to his offspring.

A heterozygous tobiano (one copy of the tobiano gene) will give you 50% chance of producing a tobiano foal from a mare that does not have the tobiano gene also.

A stallion that is "homozygous for black" would be your best chance at a bay tobiano foal (tri-colored) since he could produce either bay or black from your mare, but not chestnut since he would not carry the "red" gene ... and you don't know if your mare does or not, though you could test to find out.

bay_blnd jmpr07 · 11-02-2003, 01:23 PM

ok, now i have a genetics question--
i have a bay mare who had a chestnut sire and jet black dam, if i bred her to a jet black stud would i have a very good chance of having a black foal?

Dawn · 11-02-2003, 03:10 PM

Okay I read the original post as the horse had qualifying spots for paint. Did i read it wrong?

11-01-2003, 12:23 PM	#1
whirlybird Full Member Join Date: Sep 2003 Location: Michigan Posts: 196	Genetics question My horse is 1/2 paint 1/2 TB... the sire is a tabiano and the dam is almost black. My horse has black mane and tail, pretty dark bay coloring with two white socks and a white blaze... there are a couple small (half dollar size) black spots on her socks. Do you think that she might throw a tri-colored paint in the future? Just wondering....

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11-01-2003, 12:49 PM	#3
Dawn Senior Member+ Join Date: Nov 2002 Location: Tennessee Posts: 29,629 Images: 1283	Well it depends on what you breed her to. The only way you're even guarenteed a coloured baby is if you breed her to a homozygous stud. If you breed her to a heterozygous stud, you'll have a 75% chance of a coloured baby. And if you breed her to a non-coloured stud, you have a 50% chance. Now seeing that she's not a tri-colour, I have no idea on what her chances are of a tri-coloured baby. It would all depend on the stud.

11-02-2003, 06:51 AM	#5
sportpony Full Member Join Date: Aug 2003 Location: Kentucky Posts: 26	If the sire is tobiano and her mare is bay with stockings but no body white, she does not carry the tobiano gene so she cannot produce a paint unless she is bred to a stallion who is one. Tobiano is dominant so it is one of those "what you see is what you get". If she does not have tobiano characteristics she is not tobiano and can't produce it. It is not one of the recessives that can be hidden and not expressed. To get tobiano from her you would have to breed to a homozygous tobiano stallion. This would guarantee you a tobiano foal, since the stallion would carry two copies of the tobiano gene and would always pass one of those on to his offspring. A heterozygous tobiano (one copy of the tobiano gene) will give you 50% chance of producing a tobiano foal from a mare that does not have the tobiano gene also. A stallion that is "homozygous for black" would be your best chance at a bay tobiano foal (tri-colored) since he could produce either bay or black from your mare, but not chestnut since he would not carry the "red" gene ... and you don't know if your mare does or not, though you could test to find out.

11-02-2003, 03:10 PM	#7
Dawn Senior Member+ Join Date: Nov 2002 Location: Tennessee Posts: 29,629 Images: 1283	Okay I read the original post as the horse had qualifying spots for paint. Did i read it wrong?