  22/08/2011 22:48 |
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No Marco, There is only ONE gene "B" "barred", the only difference is in the speed the feathers grow.
On the photos you see 2 diiferent races, a cock "Plymouth Rock" (B/b+ heterozygote=single doses) and a hen "Wyandotte" (B/- hemizygote=single doses because sex-linked), the fearhers of the wing just grow quicker than the other feathers.
(* il gene "B" che è il gene "Barring" ed agisce in periodi alterni bloccando la produzione di pigmento oppure consentendola)
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