What is gene?

  • (noun): (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity.
    Synonyms: cistron, factor


A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a polypeptide or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains. Genes hold the information to build and maintain an organism's cells and pass genetic traits to offspring. All organisms have many genes corresponding to various biological traits, some of which are immediately visible, such as eye color or number of limbs, and some of which are not, such as blood type, increased risk for specific diseases, or the thousands of basic biochemical processes that comprise life.

Read more about Gene.

Some articles on gene:

Gene - Changing Concept
... The concept of the gene has changed considerably (see history section) ... It was also previously believed that one gene makes one protein this concept was overthrown by the discovery of alternative splicing and trans-splicing ... The definition of a gene is still changing ...
Mechanisms of Riboswitches
... The expression platform is what regulates gene expression ... Expression platforms typically turn off gene expression in response to the small molecule, but some turn it on ... Open Reading Frame (uORF), thereby affecting the expression of downstream genes A TPP riboswitch in plants modifies splicing and alternative 3'-end processing A riboswitch in Clostridium acetobutylicum ...
Galactosemia - Cause
... meaning a child must inherit one defective gene from each parent to show the disease ... Heterozygotes are carriers, because they inherit one normal gene and one defective gene ...
Index Of Molecular Biology Articles - G
... gel electrophoresis - gel shift - gel shift assay - gene - gene amplification - gene conversion - gene expression - gene mapping - gene pool - gene therapy - gene ...
Gene Family
... A gene family is a set of several similar genes, formed by duplication of a single original gene, and generally with similar biochemical functions ... One such family are the genes for human haemoglobin subunits the ten genes are in two clusters on different chromosomes, called the α-globin and β-gl ... Genes are categorized into families based on shared nucleotide or protein sequences ...