Crossing over or recombination of factors. — My bird is purebred, isn't it? That exclamation is heard regularly, and it is all too familiar to many enthusiasts. Breeders are increasingly asking how it is possible that there is a certain bird in the nest that does not actually belong there. As the breeding of non-classic colors in classic birds has increased, so has this phenomenon — especially since many fanciers are busy breeding without knowing what they are doing and what the consequences are.
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