Colour genetics advice

[AshryOTTB]

I know absolutely nothing about genetics, can anyone help?
Dam is a dark bay, her sire is also dark bay and her dam is bay
Sire is chestnut, his sire is grey and his dam is chestnut
Can these two produce a bright bay foal??

 

[Cloball]

Yup, there isn't a genetic difference between bright or dark bay.
So you have dam ee (no dominant extension) with unknown agouti and sire E_A_. The possibilities are chestnut, bay or black.

 

[criso]

Yes, bay is bay.

There are some theories on why you get the darker or lighter shades - e.g AA may be lighter than Aa and EE darker than Ee but not a proven thing.

Is this a foal already here or are you wondering what it can be

 

[AshryOTTB]

Yes, bay is bay.

There are some theories on why you get the darker or lighter shades - e.g AA may be lighter than Aa and EE darker than Ee but not a proven thing.

Is this a foal already here or are you wondering what it can be

A friend is hoping to put her mare in foal and was talking to me about genetics and it all went a bit over my head! I was simply curious how it all worked.

 

[AshryOTTB]

Also how do markings work, is the shape hereditary or is it random?
e.g. if dam had no markings and sire had a stripe could the foal have a different marking like a star?

 

[Cloball]

A bit hereditary and a bit may be related to position in the womb. There are some white spotting genes that can make white bits more likely w20, sabino, splash and they each look a bit different. White bits I think can also be inhibited by other genes but I'm less sure about that.
http://horse.jenniferhoffman.net/horse-color-genetics.html this is a bit out of date and not entirely accurate but it can help you get the gist if you're interested.

 

[criso]

. if dam had no markings and sire had a stripe could the foal have a different marking like a star?

Yes, you have various genes that cause white markings on the face but in some horses it will be minimal e.g. a small star and snip but on another horse it will be expressed more and be a blaze.

There's a really good Facebook group about colour genetic

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