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|Extreme dilute blue check.|
|Common name||Extreme dilute or ecru|
|Mutation type||Colour modifier|
|Commonly found in breeds such as:||Racing homer|
Extreme dilute 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.