Gene
W20 is a common variant of the KIT gene found in most breeds. On its own it adds little white, such as face and leg markings, and some W20 horses are solid; with a stronger dominant white variant on the other chromosome it usually gives an all-white horse. Two copies are viable and common.
One copy is enough to show Dominant White W20; one and two copies look the same.
Alone W20 has a small effect; it mainly adds white together with other white variants.
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Guides and articles for Dominant White W20 horse owners.
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