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You have to have Chinchilla on both strand 1 and strand 2 to have the highest chance of it passing to the foals. If you put a single strand on a foundation theres only a 50% chance of it passing to the foals, but if you're patient you can breed homozygous or double strands by the fourth generation.

Chinchilla is also a homozygous recessive gene, meaning only horses that have two copies of chinchilla will display the effect. So your best chance is to GMT a foundation stallion to be homozygous (meaning one copy on strand one and one copy on strand two). You could GMT a foundation mare to be heterozygous (one copy of the gene on either strand one or two) or homozygous in order to have a chance at getting a homozygous colt at gen 2, which will increase your odds at homozygous gen 3 foals. But...money! There are also some chinchilla foundation mares that other stables own that you might be able to purchase eggs from if you aren’t able to GMT a mare (if you have a premium upgrade, you must be a premium member to use eggs).

I used chinchilla as an example as it was the first gene to pop into my mind here is a different example.
If my stallion is e/E a/a D/D he is a grullo my mare is e/E a/a D/D she is also a grullo now because I only have the dominat black gene on 1 strand will my foal also be e/E a/a D/D? Or could my goal have the chance to drop that capital E into a lower case e?

This link should help explain it to you. :)

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