Riardi Genetic Codex- Ultra-Bright Mutation
**Ultra-Bright (UB) Mutation Inheritance
The Ultra-Bright locus functions through the interaction of the UB/ub alleles (Presence/Absence) and the UI/UFI/ui alleles (Immunity Status). Riardi with this mutation display a twice-over fur lightening effect on all colors of their body, including their main fur coloration, and it frequently drops pigment to white fur in appearance.
| UB Locus Genotype | Immunity Locus Genotype | Phenotypic Outcome |
|---|---|---|
| UB/UB or UB/ub | ui/ui | Full Ultra-Bright expression |
| UB/UB or UB/ub | UI/UI or UI/ui | Partial Ultra-Bright (Localized) |
| UB/UB or UB/ub | UFI/UFI, UFI/ui, or UFI/UI | Non-viable |
| ub/ub | Any | Normal coloration |
- Dominance: The Ultra-Bright mutation (UB) is dominant over the recessive (ub) allele. Expression occurs in any individual possessing at least one
UBcopy, provided no full immunity is present.
- Partial Immunity (UI): Acts as a spatial modifier. Rather than suppressing the mutation, it restricts its manifestation to either the primary fur coat or the secondary markings, creating a chimeric visual effect.
- Full Immunity (UFI): This represents a genetic incompatibility. When the UFI allele is paired with the UB mutation, the resulting physiological conflict renders the genotype inviable.
- Default State: In the absence of the UB mutation (
ub/ub), the immunity loci have no phenotypic impact on coloration, regardless of whetherUIorUFIis present.