● A `color{Violet}"gene"` is defined as the functional `color{Violet}"unit of inheritance"`.
● Though there is `color{Violet}"no ambiguity"` that the genes are located on the DNA, it is difficult to literally define a gene in terms of DNA sequence.
● The DNA sequence coding for `color{Violet}"tRNA or rRNA"` molecule also define a gene.
● However by defining a `color{Violet}"cistron"` as a segment of `color{Violet}"DNA coding for a polypeptide"`, the structural gene in a transcription unit could be said as:
`star` `color{Violet}"Monocistronic"` (mostly in `color{Violet}"Eukaryotes"`)
`star` `color{Violet}"Polycistronic"` (mostly in bacteria or `color{Violet}"Prokaryotes"`).
● In `color{Violet}"eukaryotes"`, the monocistronic structural genes have `color{Violet}"interrupted coding sequences"` – the genes in eukaryotes are `color{Violet}"split"`.
● The coding sequences or `color{Violet}"expressed sequences"` are defined as `color{Violet}"exons"`.
● `color{Violet}"Exons"` are said to be those sequence that appear in `color{Violet}"mature or processed RNA"`.
● The exons are `color{Violet}"interrupted"` by `color{Violet}"introns"`.
● Introns or `color{Violet}"intervening sequences"` do not appear in mature or processed RNA.
● The `color{Violet}"split-gene arrangement"` further complicates the definition of a gene in terms of a DNA segment.
● Inheritance of a character is also affected by `color{Violet}"promoter"` and `color{Violet}"regulatory sequences"` of a structural gene.
● Hence, sometime the `color{Violet}"regulatory sequences"` are loosely defined as `color{Violet}"regulatory genes"`, even though these sequences `color{Violet}"do not code"` for any RNA or protein.
● A `color{Violet}"gene"` is defined as the functional `color{Violet}"unit of inheritance"`.
● Though there is `color{Violet}"no ambiguity"` that the genes are located on the DNA, it is difficult to literally define a gene in terms of DNA sequence.
● The DNA sequence coding for `color{Violet}"tRNA or rRNA"` molecule also define a gene.
● However by defining a `color{Violet}"cistron"` as a segment of `color{Violet}"DNA coding for a polypeptide"`, the structural gene in a transcription unit could be said as:
`star` `color{Violet}"Monocistronic"` (mostly in `color{Violet}"Eukaryotes"`)
`star` `color{Violet}"Polycistronic"` (mostly in bacteria or `color{Violet}"Prokaryotes"`).
● In `color{Violet}"eukaryotes"`, the monocistronic structural genes have `color{Violet}"interrupted coding sequences"` – the genes in eukaryotes are `color{Violet}"split"`.
● The coding sequences or `color{Violet}"expressed sequences"` are defined as `color{Violet}"exons"`.
● `color{Violet}"Exons"` are said to be those sequence that appear in `color{Violet}"mature or processed RNA"`.
● The exons are `color{Violet}"interrupted"` by `color{Violet}"introns"`.
● Introns or `color{Violet}"intervening sequences"` do not appear in mature or processed RNA.
● The `color{Violet}"split-gene arrangement"` further complicates the definition of a gene in terms of a DNA segment.
● Inheritance of a character is also affected by `color{Violet}"promoter"` and `color{Violet}"regulatory sequences"` of a structural gene.
● Hence, sometime the `color{Violet}"regulatory sequences"` are loosely defined as `color{Violet}"regulatory genes"`, even though these sequences `color{Violet}"do not code"` for any RNA or protein.