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Not really by experience as I do not raise any laced birds, but I do know the genetics side. First cross and all dominant genes show, even when only one copy is present. Cross those birds together and some will inherit two copies od a dominant gene, some a copy of each and some two copies of recessive. Add to that the many, many genes in a chicken, and you can end up with a very wide assortment of genotypes. From this breeding you select the birds with the traits you want and de-select those you do not, so at this point you are eliminating the birds that don;t carry the correct genes, and the subsequent generations will each have less and less birds with the incorrect geneset. Note that you are pretty unlikely to get the exact bird you want in that F2 or even F3 generation, unless you hatch many, many chicks. THe farther apart the two parent birds are genetically, the more generations it will take to mix the traits.