The white feather coloring is a recessive trait occasionally thrown by Cream Legbars. So what were bred together to breed cream legbars?
Cream Legbars were created by cross-breeding American barred Plymouth Rock birds with brown Leghorns which created the gold and silver legbars.
The cream Legbar was created by cross-breeding these with white Leghorns; then crossing those with Araucanas causing them to have a crest and to lay blue or blue-green eggs.
So it looks like white leghorn genes expressing themselves and dominating all other colors.
So Dom White.
No wonder I am enraptured with Glynda. She part leghorn!
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