This is still a work in progress, I just decided to publish it and continue working on it with it published

Just what the title says

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In this I'm going to teach you how to read a genetics test, figure out the % chance of a gene being passed on, and what genes make what colours in the first place.

I am subscribed to this topic so once it's completed feel free to post your questions here and I'll get back to you asap!

PART ONE: Genetic tests

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So, take a quick skim through the gene test and familiarise yourself with the different sections.

Part 1:1 Extensions and Agouti

Extensions determines what the base colour will be by allowing black pigment to be expressed in the coat. ee is chestnut, Ee and EE can be either bay or brown or black.

Agouti determines what colour the horse will be if it is not chestnut by controlling the distribution and location of black in the horse's coat. If it is chestnut then it can carry any of the following because the agouti is irrelevant to the coat colour as it doesn't have any affect on chestnuts.

Anything with all lowercase letters is a gene she doesn't have, so this mare does not carry roan (rnrn) dun (dd) champagne (chch) grey (gg) white (ww) sabino (sbsb) frame (oo) or PATN-1 (patn-1patn-1).

Pearl is a recessive gene, so if the horse has PrlPrl it does not carry it, Prlprl means it has one copy, and prlprl means the horse carries two copies of it.

Back to our example gene test.. this mare has heterogygous (single copy) genes of silver (Zz) splash white (Splspl) rabicano (Rbrb)

And she has homozygous (double copies) of tobiano (ToTo) leopard complex/appaloosa (LpLp) and PATN-2 (PATN-2PATN-2)

Since she carries one copy of the splash white gene (Splspl) that gene is heterogynous. She carries two copies of the leopard complex (LpLp) which makes it homozygous, which means she is guarenteed to pass one copy of the appaloosa gene to her offspring.

Heterozygous genes means the horse carries one copy of a gene, and homozygous means they carry two copies of that gene and guarentee that their offspring will inherit that gene from them. So her foals are guaranteed to inherit tobiano, appaloosa, and P2

Anything in phenotype does not get passed down to offspring, it's randomised. Brindle should technically be in there too since it is not inheritable. We'll come back to it later with some more examples of phenotype genes :D

Part 1:3 Recap

To recap

- extensions are the base colour, agouti is the gene that determines what

- colour the horse will be if it is not a chestnut

-the different colour patterns are what give the horses patterns

-the pattern genes at the bottoms of the page (P1, P2) affects what appaloosa and tobiano patterns the horse has. (fun fact, horses can have Lplp/LpLp that doesn't show up in their coats if they don't have have any pattern genes)

-phenotypes are random and do not get passed down to offspring

PART TWO: Duns and Dilutes and Creams, oh my!

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Part 2:1 Chestnuts