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In genetics, non-coding DNA describes DNA which does not contain instructions for making proteins (or other cell products such as noncoding RNAs). In eukaryotes, a large percentage of many organisms' total genome sizes are comprised of noncoding DNA (a puzzle known as the "C-value enigma"). Some noncoding DNA is involved in regulating the activity of coding regions. However, much of this DNA has no known function and is sometimes referred to as "junk DNA". Image File history File links Please see the file description page for further information. ...
In molecular biology, junk DNA is a collective label for the portions of the DNA sequence of a chromosome or a genome for which no function has yet been identified. ...
Genetics (from the Greek genno γεννώ= give birth) is the science of genes, heredity, and the variation of organisms. ...
The general structure of a section of DNA Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the biological development of a cellular form of life or a virus. ...
RNA codons. ...
A representation of the 3D structure of myoglobin, showing coloured alpha helices. ...
It has been suggested that this article or section be merged into non-coding RNA. (Discuss) The term noncoding RNA (ncRNA) referes to molecules which are neither used as messenger RNA, ribosomal RNA nor transfer RNA. Other names for this class of oligo- and polynucleotides are small non-mRNA (smnRNA...
Kingdoms Animalia - Animals Fungi Plantae - Plants Protista A eukaryote (IPA: ) is an organism with a complex cell or cells, in which the genetic material is organized into a membrane-bound nucleus or nuclei. ...
Genome size refers to the total amount of DNA contained within one copy of a genome. ...
// Definition and origin The C-value enigma is a term used to describe the complex puzzle surrounding the extensive variation in nuclear genome size among eukaryotic species. ...
In molecular biology, junk DNA is a collective label for the portions of the DNA sequence of a chromosome or a genome for which no function has yet been identified. ...
Recent evidence suggests that "junk DNA" may in fact be employed by proteins created from coding DNA. An experiment concerning the relationship between introns and coded proteins provided evidence for a theory that "junk DNA" is just as important as coding DNA. This experiment consisted of damaging a portion of noncoding DNA in a plant which resulted in a significant change in the leaf structure because structural proteins depended on information contained in introns. In the scientific method, an experiment (Latin: ex-+-periri, of (or from) trying), is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena. ...
Diagram of the location of introns and exons within a gene. ...
See also Eukaryotic chromosome fine structure refers to the structure of sequences for eukaryotic chromosomes. ...
RNA codons. ...
Diagram of the location of introns and exons within a gene. ...
In molecular biology, junk DNA is a collective label for the portions of the DNA sequence of a chromosome or a genome for which no function has yet been identified. ...
In genetics, a promoter is a DNA sequence that enables a gene to be transcribed. ...
A regulatory sequence is a promoter, enhancer or other segment of DNA where regulatory proteins such as transcription factors bind preferentially. ...
A telomere is a region of highly repetitive DNA at the end of a chromosome that functions as a disposable buffer. ...
References - Bennett, M.D. and I.J. Leitch (2005). “Genome size evolution in plants”, T.R. Gregory (ed.): The Evolution of the Genome. San Diego: Elsevier, 89-162.
- Gregory, T.R (2005). “Genome size evolution in animals”, T.R. Gregory (ed.): The Evolution of the Genome. San Diego: Elsevier.
// Summary The Evolution of the Genome is a book edited by Dr. T. Ryan Gregory of the University of Guelph, Ontario, Canada, covering a wide range of topics in the study of genome evolution. ...
// Summary The Evolution of the Genome is a book edited by Dr. T. Ryan Gregory of the University of Guelph, Ontario, Canada, covering a wide range of topics in the study of genome evolution. ...
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