Having absent or deficient melanin. Widely used term for "amelanistic".

Any of the alternative forms of a gene that may occur at a given locus.

Having no melanin (black or brown pigment).

Having no red pigment.

Having no yellow pigment.

One of the linear or sometimes circular DNA-containing bodies of viruses, prokaryotic organisms, and the cell nucleus of eukaryotic organisms that contain most or all of the genes of the individual.

A gene that causes the homozygous form to look different than the wild-type and the heterozygous form to have traits of both.

(deoxyribonucleic acid) Basically the molecular basis of heredity.

A gene that causes an animal to look different than the wild-type and where the homozygous form and the heterozygous form look the same as each other.

Being heterozygous for two different traits.

First filial generation.  The offspring of the P generation.  An F₁ is a single member of the F₁ generation.

Second filial generation.  The offspring of two F₁s.

Third filial generation.  The offspring of two F₂s. .

Having or assuming the relation of a child or offspring.

A specific sequence of nucleotides in DNA or RNA that is located in the germ plasm usually on a chromosome and that is the functional unit of inheritance controlling the transmission and expression of one or more traits by specifying the structure of a particular polypeptide and especially a protein or controlling the function of other genetic material.

The study of heredity.

All or part of the genetic constitution of an individual or group.

Abbreviation for heterozygous.

Having the two alleles at corresponding loci on homologous chromosomes different for one or more loci - normal in appearance but carries the homozygous gene.

A state in which both genes for a specific trait are the same. When a recessive gene is it its homozygous form, it makes the animal look different from the wild-type. When a dominant gene is in its homozygous state, it causes the animal to look different from both the wild-type and the heterozygous (co-dominant) forms.

An animal having less black and/or brown color than a wild-type.

A pure white animal with dark eyes.

(pl. loci) The position in a chromosome of a particular gene or allele.

Black or brown skin pigments.

Abnormally dark, especially due to an increase of melanin.

An abnormal gene that under certain circumstances can cause an animal to be born with an appearance other than wild-type.

An animal with no mutated genes - "wild type" in appearance.

Two unlike individuals that begin a genetics experiment, or breeding program.

The visible properties of an organism that are produced by the interaction of the genotype and the environment.

An animal from a known breeding that has either a 50% or 66% possibility of being "heterozygous" for a mutant gene.

A 66% possible het comes from breeding 2 heterozygous animals together: 50% of the offspring are heterozygous, 25% will be homozygous, and 25% will be wild-type. Of the normal appearing animals, 66% (or roughly 2 out of 3) will actually be heterozygous for the mutated gene.

A 50% possible het comes from breeding a heterozygous animal to a wild-type animal. All of the resulting offspring will be wild-type in appearance, but 50% of them will actually be heterozygous for the mutated gene and must be bred out to determine which animals are really hets.

An n x n square used in genetics to calculate the frequencies of the different genotypes and phenotypes among the offspring of a cross.

A gene that affects an animal's appearance if it's present in the homozygous state. A heterozygous animal carrying a mutated, recessive gene looks normal.

Commonly used herpetocultural term for the dominant form of a co-dominant mutation.

Being heterozygous for three different traits.

An enzyme required for synthesizing melanin.

An albino whose cells lack tyrosinase, producing a white and yellow/orange animal with pink eyes. A separate albino mutation from tyrosinase-positive. Also called T-.

An albino not able to synthesize melanin, but capable of synthesizing tyrosinase, which results in lavender-brown skin color. Also referred to as T+.

Normal in appearance.

Having more yellow color than wild-type.