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Congrats, he is gorgeous.

Someone will come along to explain it better than I can but, basically, it is a 50/50 chance whether the foal will inherit from the paternal or maternal side of their parents regardless of what sex it turns out to be.

As BlackWyld explained, it is 50/50 which allele the sire passes to his offspring.

The way I look at it is this- your sire “inherited” the onyx gene from his imaginary dam and that is how it is written in the genotype- sire’s contributed allele first and dam’s contributed allele 2nd. With your stud it is notated as nd2/onyx. You can figure out what sire and mare contribute to foal’s overall genotype this way.

Now, for inheritance purposes, it is 50/50 which allele the sire will pass regardless of if it is from his dam or sire. In this case, the stud passed his onyx gene onto the foal which then shows in the foal’s genotype as onyx/nd2 because foal inherited it from his sire.

The foal’s dam only has nd2 so that is all she can contribute- nd2 or nd2. She can not pass on genes she does not have (in this case, onyx) and is a XX mare. Onyx to my knowledge is not a sex linked allele so having the onyx gene on the maternal or paternal side of the genotype will not influence the number of onyx fillies or studs. It is 50/50 every time for onyx to pass and another 50/50 every time if foal is a colt or filly.

I hope that makes sense and was of some help. Please let me know if there is anything I can clarify!

Let's put it like this - our imaginary gene, onyx, isn't sex linked. In fact, none of the genes involved in color in the game are sex linked. Neither are their real life counterparts, as far as I'm aware, for those that aren't fantasy genes. Since the genes are all on the somatic chromosomes, not the sex chromosomes, no, the sex chromosomes don't make any difference in heritability patterns in the game. They wouldn't in real life either

One additional bit of information--Onyx is a Dun mutation (although a fantasy one). Therefore it lies on Chromosome 8. For more information about the real Dun gene, TBX3, you can check out this page in our Genetics guide. http://www.huntandjump.com/geneticsguide/?page_id=59