As opposed to agenesis, which refers to the complete failure of an organ to develop, dysgenesis usually implies disordered development or malformation and in some cases represents the milder end of a spectrum of abnormalities.
Dysgenesis occurs during fetal development immediately after conception.
One of the first organs that is affected is the brain, this is known as cerebral dysgenesis.
Dysplasia is a form of dysgenesis in adults that alters the size and shape of their cells that lead to abnormal development.
Examples: This developmental biology article is a stub.