Doshas are the governing principles of intelligence that underlies all the structure and function of the universe. Each one of us is comprised of a unique mix of three mind/body principles which are responsible for our 'unique' physical, mental and emotional characteristics.
How are doshas formed?
The Pancha Mahabuthas are the 5 gross elements that form the doshas.
Prakriti --> Basis Genetic Constitution
Our basic genetic constitution is called Prakriti in Vedas.
It is formed at the moment of conception.
It arises due to u unique combination of varying amounts of the 3 doshas.
it determines your individuality/ your personality.