Cat Coat Color Calculator
Predict your kittens' possible coat colors, patterns, and hair length from their parents. Choose visible coat traits or enter known genetic DNA results.
Quick Cross Simulator
Test common parent pairings with 1-click presets.
How to Use the Cat Coat Color Calculator
Predict possible kitten coat colors, patterns, and hair lengths in seconds. Based on principles of feline coat color genetics, our interactive tool computes sex-linked inheritance, dilution enzymes, and agouti patterns from parental traits.
Select the mother (Queen) visible coat color, pattern, white spotting, and hair length.
Specify any known hidden carrier genes (dilution, longhair, chocolate, solid).
Select the father (Tom) coat traits and carrier statuses.
Review the live probability bars and sex-segregated kitten outcome list.
Switch to Advanced DNA Specs if you have veterinary panel results (UC Davis VGL).
Why Calculate Cat Genetics?
Cat coat genetics follow deterministic Mendelian and sex-linked rules. Understanding parental inheritance helps owners and breeders:
- Predict Litter Diversity: Anticipate rare colors like lilac, fawn, or cream before kittens arrive.
- Uncover Hidden Carriers: Explain how two solid shorthairs can produce dilute or longhaired offspring.
Feline Genetics Inheritance Model
Kitten coat probabilities are calculated by crossing maternal and paternal gametes across independent loci using Punnett squares.
For detailed genomic research on the X-linked ARHGAP36 locus, see the genetic basis of orange coat color in domestic cats.
Rule 1: Sex-Linked Orange (ARHGAP36)
Female = X(maternal) + X(paternal)Male = X(maternal) + Y(paternal)Rule 2: Multi-Locus Probability Product
P(Kitten) = P(O) × P(B) × P(D) × P(A) × P(S) × P(L)X-Linked Segregation
Orange locus alleles separate; male kittens inherit their only X chromosome from the mother.
Eumelanin Dominance
Black (B) dominates Chocolate (b) and Cinnamon (bl) in non-orange coat regions.
Dilution Recessive
Two dilute alleles (dd) lighten black to blue, chocolate to lilac, and red to cream.
Pattern & Epistasis
Agouti enables tabby banding, while orange epistatically displays ghost striping.
Common Parent Cross Example
When a Black Queen ($oo$) is crossed with an Orange Tom ($OY$), sex-linkage splits the litter:
Core Feline Gene Loci
Standard veterinary symbols and dominance rankings, including TYRP1 brown and cinnamon variants.
| Locus / Gene | Alleles | Phenotypic Effect |
|---|---|---|
| Orange (ARHGAP36) | O (Orange) > o (Non-orange) | Sex-linked Red/Tortie |
| Brown (TYRP1) | B (Black) > b (Choc) > bl (Cinn) | Base Eumelanin |
| Dilution (MLPH) | D (Dense) > d (Dilute) | Blue, Lilac, Cream |
| Agouti (ASIP) | A (Agouti) > a (Solid) | Tabby vs. Solid |
| White Spot (KIT) | Ws (Spotting) > N (Solid) | Piebald & Bicolor |
| Length (FGF5) | N (Short) > M1-M4 (Long) | Hair Length |
Feline Genetics Specifications
Coat expression involves complex enzyme pathways. Knowing carrier statuses ensures precise breeding predictions.
Pro Tip
“All orange and cream cats display visible tabby markings because the orange gene overrides non-agouti suppression.”
Key Inheritance Guidelines
Orange coloration is carried exclusively on the X chromosome. A male kitten inherits his single X chromosome from his mother, so a queen determines her sons' orange or non-orange color.
The melanophilin (MLPH) gene is responsible for recessive dilute coat color, which turns dense black to blue and red to cream.
Cat Coat Genetics FAQ
Essential answers for feline coat color inheritance and kitten predictions.
Why are almost all tortoiseshell and calico cats female?
The orange gene is on the X chromosome. Because females have two X chromosomes (XX), they can inherit both orange (O) and non-orange (o) alleles. Random X-inactivation (Lyonization) creates the tortoiseshell mosaic pattern. Males (XY) only have one X, making them either solid orange or solid non-orange.
Can two shorthair cats produce longhair kittens?
Yes! Longhair is caused by recessive mutations in the FGF5 gene. If both shorthair parents carry a hidden recessive longhair allele (Ll), each kitten has a 25% chance of inheriting two mutant alleles (ll) and expressing a longhair coat.
FGF5 longhair mutations in catsCan two black cats have blue or grey kittens?
Yes. If both black parents carry the recessive dilution allele (Dd), there is a 25% chance for any kitten to inherit dd. Dilution disperses eumelanin pigment granules, turning black into blue (grey).
What color kittens will a black female and orange male have?
Due to sex-linkage, 100% of female kittens will be tortoiseshell (Oo) because they inherit an orange X from the father and a black X from the mother. 100% of male kittens will be black (oY) because they inherit their only X chromosome from the black mother.
What does a 25% probability mean for a litter of kittens?
A 25% probability applies independently to each kitten, like rolling a 4-sided die for each fertilization. A litter of 4 kittens may have zero, one, or several kittens expressing that trait.
Why do all orange cats have tabby stripes?
The orange gene (O) is epistatic over the non-agouti (aa) solid gene. While black-based cats carrying aa become solid, the orange pathway does not suppress agouti pattern expression, meaning red and cream cats always show tabby markings.
What is the difference between tortoiseshell and calico?
Both possess the same Oo heterozygous orange genotype on a black base. Calico cats also have the white spotting gene (KIT), which produces larger, distinct solid patches of black, orange, and white.
Can I determine a cat's genotype from a photo?
Only partly. Visual inspection reveals phenotype, but cannot determine whether a dominant cat carries hidden recessive alleles for dilution, longhair, or chocolate without pedigree history or DNA swab testing.
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