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Yes, that is correct. The parents of the chick in question supposedly came from pure Welsummers.
A new, recent, and important fact has just came to light. The person who has the Welsummers who had the totally blonde looking chick, just informed us that she got her birds from a lady who got her birds from another lady who got those birds from two different hatcheries.
Plus she posted pictures of the blonde chicks along with three other "normal" looking Welsummer chicks. The pictures, coupled with the new information about hatchery birds being in their ancestry, pretty much convince me that they are the result of something other than a random mutation let alone a Splash.
My Welsummer breeder, who was one of the original five breeders, has hatched thousands of chicks and he's never seen a Splash Welsummer. Nor a Sport.
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If we are defining "Sport" as a random, spontaneous genetic mutation, I don't see how the above would hold true. If we are defining "Sport" as an unexpected recessive gene suddenly surfacing, it would seem to me that there would still be a percentage chance of it not breeding true. I'd have to go back and figure out on my Genetics Probability Calculator thing I found what the likelihood is but I can't see how it would be 100%.
God Bless,