Inheritance is defined by a set of related individuals who have the same or similar phenotypes for a locus of a particular gene.
[1] Possible explanations for Mendelian errors are genotyping errors, erroneous assignment of the individuals as relatives, or de novo mutations.
Mendelian error is established by demonstrating the existence of a trait which is inconsistent with every possible combination of genotype compatible with the individual.
Genetic inconsistencies which do not correspond to this definition are Non-Mendelian Errors.
Statistical genetics analysis is used to detect these errors and to detect the possibility of the individual being linked to a specific disease linked to a single gene.