De Vries gave his mutation theory on organic evolution while working on-
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Evening primrose
Hugo de Vries, working on the evening primrose, gave the idea of mutations: large sudden changes in a population. He held that mutation, not small variations, causes evolution, and called sudden single-step large mutations saltation.
Option (1) Pisum sativum — Incorrect. The garden pea was Mendel’s plant for his laws of inheritance.
Option (2) Drosophila melanogaster — Incorrect. The fruit fly was used by T. H. Morgan to study linkage and sex-linked genes.
Option (3) Evening primrose — Correct. Hugo de Vries, working on the evening primrose, brought forth the idea of mutations: large, sudden variations that cause speciation. He called this saltation.
Option (4) Althea rosea — Incorrect. The hollyhock is not linked with de Vries’ theory.
NCERT Extract:
Mechanism of Evolution – …
