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In sexually reproducing organisms, a specialized form of cell division called meiosis produces cells called gametes or germ cells that are haploid, or contain only one copy of each gene. [51]: 20.2 The gametes produced by females are called eggs or ova, and those produced by males are called sperm.
Genes are like sentences made of the "letters" of the nucleotide alphabet, between them genes direct the physical development and behavior of an organism. Genes are like a recipe or instruction book, providing information that an organism needs so it can build or do something - like making an eye or a leg, or repairing a wound.
Gene structure is the organisation of specialised sequence elements within a gene. Genes contain most of the information necessary for living cells to survive and reproduce. [ 1 ] [ 2 ] In most organisms, genes are made of DNA, where the particular DNA sequence determines the function of the gene.
A gene is a sequence of DNA that contains genetic information and can influence the phenotype of an organism. Within a gene, the sequence of bases along a DNA strand defines a messenger RNA sequence, which then defines one or more protein sequences.
Molecular genetics is a branch of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms. Molecular genetics often applies an "investigative approach" to determine the structure and/or function of genes in an organism's genome using genetic screens.
For example, glucagon and similar polypeptides (such as GLP1 and GLP2) all come (via PTM) from proglucagon, which comes from preproglucagon, which is the polypeptide that the GCG gene encodes. When one speaks of the various polypeptide products, the names and symbols refer to different things (i.e., preproglucagon, proglucagon, glucagon, GLP1 ...
The first scientific contribution of the club, later recorded as "one of the most important unpublished articles in the history of science" [7] and "the most famous unpublished paper in the annals of molecular biology", [8] was made by Crick. Crick presented a type-written paper titled "On Degenerate Templates and the Adaptor Hypothesis: A Note ...
Unidirectional or tandem overlap: the 3' end of one gene overlaps with the 5' end of another gene on the same strand. This arrangement can be symbolized with the notation → → where arrows indicate the reading frame from start to end. Convergent or end-on overlap: the 3' ends of the two genes overlap on opposite strands. This can be written ...