Blue Budgerigar Mutation

The Blue budgerigar mutation is one of approximately 30 mutations affecting the colour of budgerigars. It is part of the genetic constitution of the following recognised varieties: Skyblue, Cobalt, Mauve and Violet.

Read more about Blue Budgerigar Mutation:  Appearance, Historical Notes, Genetics

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Blue Budgerigar Mutation - Genetics
... The Blue mutation is recessive to its wild-type allele, so a bird possessing a single Blue allele (the heterozygote) is identical in appearance to the wild-type light green ... Among the budgerigar fancy such a bird is said to be a Light Green split blue, usually written Light Green/blue ... In a bird which has two Blue alleles (the homozygote), the lack of the wild-type allele means the yellow pigment can no longer be produced, and so the body colour is blue — the Skyblue ...

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