Cat Colours Explained Part 1

This article was originally published in Maystar Mews Issue Four, 2026 — the Maystar Devon Rex Cattery newsletter. I’m grateful for the opportunity to share genetics education with a wider breeding community.
The Colour Trap explores why genetic testing matters more than pedigree records when it comes to colour accuracy. What we see on the outside doesn’t always match what’s written in genetic code — and mistakes in colour determination can carry through generations if left unchecked.
Understanding Locus B, Locus D, Locus O, and Dilute Modifier isn’t just academic. It’s the foundation of responsible breeding decisions, transparency in pedigrees, and accountability to every kitten we b ring in to the world.

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