Genetics / Fine Structure of Gene - at the Genetic Level
Fine Structure of Gene - at the Genetic Level
In previous topics, various principles of genetics were explained with the help of a unit of heredity, the
gene. Although the term
genetics was first used by
Bateson in 1905, the term
gene (derived from the Greek word
genetics, meaning to be born) was proposed in 1909 for the first time by
Johannsen. It was subsequently also regarded- as a
unit of function, unit of mutation and
unit of recombination. This means that a gene was believed to be a hereditary unit, which was independent in controlling a function leading to appearance of a phenotypic trait for which it was meant. It was also the smallest unit that could undergo a mutational change or could take part in recombination. Such a view was the result of a belief in particulate inheritance, according to which a gem; was a locus or a point having no dimensions.
In this section, we will discuss the work, which led to changes in our concept of allelomorphs and allowed a study of fine structure of gene at the intragenic level. It will be shown how micromaps for individual genes could be prepared through recombination technique.
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