Split refers to a bird who carries one allele of a recessive gene/trait. In other words, they carry it but don't show it, and that's the only difference between the "split" and the real one.
So, a Tolbunt split is a Gold Laced Polish who carries mottling (the white tips) but not 100%, thus, you can't see it.
A Lavender Split for another example is a black bird who carries Lavender but doesn't show it, for Lavender is simply a diluted (from the lav) black.
But in another example of differing and recognizing "splits" - my WCB x Tolbunts aren't splits. They carry the mottling and don't show it, but that's just part of the difference
They're also carrying only half the lacing gene, columbian gene, darkbrown gene, crowwing, etc. Big difference, making the bird not a split. A split is the same as the normal, but with the recessive part of the normal not showing up visually.
So, a Tolbunt split is a Gold Laced Polish who carries mottling (the white tips) but not 100%, thus, you can't see it.
A Lavender Split for another example is a black bird who carries Lavender but doesn't show it, for Lavender is simply a diluted (from the lav) black.
But in another example of differing and recognizing "splits" - my WCB x Tolbunts aren't splits. They carry the mottling and don't show it, but that's just part of the difference

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