Hugo de Vries formulated his Mutation Theory of Evolution based on his experiments on which plant?
Answer and explanation
Correct answer: A. Evening primrose (Oenothera lamarckiana)
- Step 1: In 1901, Dutch botanist Hugo de Vries conducted breeding experiments with the evening primrose (Oenothera lamarckiana).
- Step 2: He noticed sudden, large phenotypic changes appearing in offspring that bred true in subsequent generations.
- Step 3: He proposed that evolution proceeds by sudden, discontinuous, single-step macromutations (saltation), in contrast to Darwin's gradual minor variations.
Answer
Evening primrose (Oenothera lamarckiana).
Why not the others: Garden pea was used by Gregor Mendel; Four o'clock plant was used by Carl Correns for non-Mendelian plastid inheritance; Snapdragon was used for incomplete dominance studies.
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