Pure line theory was developed by_______________?
Correct answer: D. Johannsen (1903)
- A. Thoday (1960)
- B. Mather (1951)
- C. Allard (1957)
- D. Johannsen (1903)
Explanation
Johannsen developed the pure line theory in 1903 after showing that selection within a genetically uniform pure line cannot produce permanent genetic improvement. This distinguished heritable variation from temporary environmental variation.
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