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Phenotype: The brown gene affects scale color in drakes by controlling the size of pigment granules.
Drakes homozygous (b/b) for the recessive allele b have pigment granules that are reduced in size.
When scales are examined microscopically in cross section, pigment granules of normal size (B/*) appear black, while smaller pigment granules (b/b) appear brown.
Recessive alleles of the colorless gene are epistatic to brown; both c/c B/* and c/c b/b have translucent white scales.
In the absence of colorless, the brown gene produces the scale colors described below:
| | B/* | b/b |
| M/* D/* |
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| Steel | Copper |
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| | B/* | b/b |
| m/m D/* |
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| Charcoal | Earth |
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| | B/* | b/b |
| M/* d/d |
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| Argent | Gold |
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| | B/* | b/b |
| m/m d/d |
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| Dust | Sand |
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Phenotype Terms:
integument phenotype
pigmentation phenotype
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