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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • The term “gene” was coined by: (CG RAEO 2017)

    Question: The term "gene" was coined by: (CG RAEO 2017)

    Options:

    Mendel
    Bateson
    Shull
    Johannsen

    ✅Explanation: The credit for coining the term "gene" goes to Wilhelm Johannsen, a Danish botanist. In 1909, he introduced the term in his book "Elemente der exakten Erblichkeitslehre" (Elements of the Exact Theory of Heredity) to describe the fundamental units of heredity based on the work of Gregor Mendel.
    -While Mendel laid the foundation of modern genetics with his laws of inheritance…
    -Bateson is often credited with coining the term "genetics" in 1905…
    -Shull also contributed to early genetics, but his work focused on concepts like genotype and phenotype.

    • Johannsen's Contributions:
    -Beyond introducing "gene," he also distinguished between genotype (the genetic makeup) and phenotype (the observable traits). This distinction remains fundamental in genetics today.
    -His work on pure lines helped solidify the understanding of genes as discrete units responsible for specific traits.

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