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Reduced bar and check racing homers.
Reduced bar and check racing homers.
Locus r locus
Genetic symbol r
Common name reduced
Inheritance Sex-linked recessive
Mutation type Colour modifier
History Discovered in roller pigeons

Reduced is an allele at the r locus. This mutation is recessive to wild type.



Reduced is a sex-linked recessive mutation. This means that both parents need to carry the mutant gene for it to express in a cock the next generation, but only the father needs to carry it for the gene to express in a hen. As a sex-linked recessive mutation, it is possible for this mutation to be carried by cock bird who does not visually express it, but any hen who carries the gene will show it.


Apart from wild type, the other allele at the r locus is rubella.


Reduced was discovered in American roller pigeons by a young boy in the 1950s. He showed the odd-coloured pigeon to Carl Graefe who identified it us a previously unknown gene and investigated.