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Carrier: The animal has a normal and a mutant copy of a gene, i.e., is heterozygous.

Health Registry: Database containing the health screening information and identifying characteristics such as breed, sex, age, and pedigree of individuals.

Health Screening: The use of tests to identify individuals that do not exhibit overt clinical signs yet have risk factors or early stages of disease.

Homozygous: Both copies of a gene are the same, i.e., the DNA sequence is the same.

Linked Test: A test that targets the region of DNA that is generally associated with the disease.

Mutation Test: A test that targets the actual DNA change that causes the disease; sometimes referred to as a direct genetic test.

Phenotypic Test: A test that detects visible or measurable differences related to a disease.