Some genomic testing companies are searching for specific markers when they are analyzing your genomic data. Genomic markers are a single gene sequence or point along that sequence that indicates a unique trait.
Genetic markers are located on chromosomes, which are the tightly-bound coils where our DNA is stored. Humans have 46 chromosomes, which are stored in 23 pairs. One chromosome is inherited from a person’s mother, and another is inherited from a person’s father.
That’s why family history is crucial when determining a person’s risk for a disease. You are inheriting all of your genetic information from your parents. If one parent has inherited a disease, you might not be at risk – unless another parent is a carrier for the disease.