Ousiotype is a term defined in segregation analysis
. The phenotype
scrutinized by segration analysis may be due to common (C) or rare (R) factors, which might be environmental
. Individuals whose phenotype is due to common factors (C), rare (R) or both (CR) define the ousiotypes.
Cannings defines a set of five rules, the second and third are collectively called the penetrance rules
, the final two collectively specify the mode of transmission
. The set of five rules specify the model
. The ousiotype of an individual in a genetic model is the individual's genotype