The disease-causing agents can be classified as follows:
I. Genetic or Inherited Causes: These causes are transmitted to the offspring through the germplasm.
Cryptorchidism: The condition in which one or both testicles do not descend to the scrotal sac and remain in the abdominal cavity. The testicle is complete or partial non-functional in this condition.
Webbed digits: Web-like structures are present in between the digits.
II. Non-genetic or Non-inherited Defects: These causes do not transmit through the germplasm.
Anomalies: Developmental defect affecting an organ or part of the body.
1. Disturbances in the development
2. Arrest of development
3. Excessive Development