FINE STRUCTURE OF A GENE
HISTORY
* Term GENE was introduced by JOHANSSEN in 1909
based on Mendelian Factors.
* Gene Concept was given by SUTTON.
* Studied & Elaborated by MORGAN, BRIDGES, and
MULLER
ESSENTIAL FEATURES
o Determines the physical as well as physiological
characters.
o Situated in the chromosome.
o Occupies a specific position known as Locus.
o Arranged in single linear order.
o Occur in functional states called Alleles.
o Some have more than 2 alleles known as Multiple
Alleles.
o Some may undergo sudden change in
expression called as Mutant Gene
(Mutation).
o May be transferred to its homologous
(Cross-over) or non-homologous
counterpart (Translocation).
o Can duplicate themselves very accurately
(Replication).
o Synthesizes a particular Protein.
o Determines the sequence of amino acid in
the polypeptide chain (The Genetic
Code).
