Pureline Theory Research

The Pureline theory, a foundational concept in genetics, was proposed by Wilhelm Johannsen.

Johannsen's Experimental Subject

Johannsen conducted his significant experiments on the inheritance of traits using the 'Princess' variety of French bean (Phaseolus vulgaris).

Key Findings of Pureline Theory

• Johannsen demonstrated that selection within a pure line (genetically uniform individuals) does not result in significant heritable changes.
• He showed that apparent variations were largely due to environmental influences or segregation of pre-existing genetic factors, not continuous variation within the pure line itself.
• This work highlighted the importance of genetic purity and stability in understanding inheritance.

Therefore, Johannsen's work leading to the Pureline theory was based on his studies with the 'Princess' variety of French bean.