Extreme dilute

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Extreme dilute
Extreme dilute blue check.
Extreme dilute blue check.
Locus d locus
Genetic symbol d^ex
Common name Extreme dilute or ecru
Inheritance Sex-linked recessive
Mutation type Colour modifier
Commonly found in breeds such as: Racing homer

Extreme dilute or ecru refers to at least one (and possibly more than one) allele at or the d locus. This mutation is sex linked and recessive to wild type.



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.


Apart from wild type, the other alleles at the d locus are pale and dilute.