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STD 12 - 6. evolution — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 6. evolution1 Mark
MCQ
The idea of mutations was brought forth by
  • ✓
    Hugo de Vries who worked on evening primrose
  • B
    Gregor Mendel who worked on Pisum sativum
  • C
    Hardy Weinberg who worked on allele frequencies in a population
  • D
    Charles Darwin who observed a wide variety of organisms during sea voyage.
✓

Answer

Correct option: A.
Hugo de Vries who worked on evening primrose
a
(a) : The term mutation was coined by Hugo de Vries $(1901)$ for large spontaneous inheritable changes which occur suddenly in naturally reproducing population. He also proposed mutation theory of evolution in his book “The Mutation Theory” published in $1903$ in which he put forth that evolution occurred due to large discontinuous variations. He worked on Oenothera lamarckiana or evening primrose. During his experiments he found $834$ mutations in a population of $54343$ plants. It was later on found that the mutations observed by Hugo de Vries were actually chromosomal aberrations.

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