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Dark Locus: Gold Marble Phenotypes
The allele for gold marble is on
the dark locus and is designated with the symbol Gm.
Gold marble (Gm) exhibits co-dominance (blending of traits) with the wild type allele (+). It is recessive to the black (D) and the marble (M) alleles and is dominant over the gold (g) allele. Two distinct phenotypes of gold marble occur: gold marble and silver gold marble. The table below summarizes how the allele for marble interacts with other alleles at this locus to form the gold marble phenotypes.
Gold Marble Gold marble may be homozygous with two alleles for the gold marble trait (Gm/Gm) or it may be heterozygous with one gold marble allele paired with one gold allele (Gm/g).
A gold marble is predominantly pale gold colored with random black markings. The tail, dorsal and anal fins will typically exhibit some combination of black and white bands or stripes running the length of the tail or fin. Occasionally an entire fin or tail may be completely white or completely black. The ventral fins may both be black, both white, or one may be black and the other white. The crown is typically darker than the body, with a dark yellow to orange coloration. A heterozygous gold marble (Gm/g) will generally exhibit less area with black markings than a homozygous gold marble (Gm/Gm). Sometimes the black markings may only consist of one or two small black spots. However, the amount of black can very from one fish to another, and from one strain to another, making it generally difficult to determine the genotype accurately in most gold marbles.
Silver Gold Marble
Factors that Affect Expression of the Gold Marble Phenotype:
Changes in the Phenotype as the Angelfish Matures Gene Interactions A number of additional phenotypes can be formed when gold marble phenotypes are combined with non-wild alleles of other genes. All of these phenotypes still are predominantly gold marble in appearance. Probably the most popular phenotype is the gold marble blushing, which results from the addition of two stripeless alleles (S/S) to gold marble. When the crown is yellow to orange, gold marble blushing is commonly called koi. The table below summarizes phenotypes that can be formed from combining gold marble phenotypes with non-wild alleles at other loci.
Table note:
[1] Information was not found to confirm the interaction between gold
marble
and zebra. Approved by The Angelfish Society Standards Committee on February 11, 2007.
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Web Team Updated 08/26/2009
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