In this article we will discuss about the role of environment in changing the form and degree of expression of some genes resulting in a corresponding change in the phenotype. Penetrance and Expressivity: The presence of a gene does not always bear an absolute relationship with the appearance or absence of a trait. In the ABO blood group system, the [...]
In this article we will discuss about the regulation of gene expression in prokaryotes and eukaryotes. The DNA of a microbial cell consists of genes, a few to thousands, which do not express at the same time. At a particular time only a few genes express and synthesize the desired protein. The other genes remain silent at this moment and [...]
Essay on Regulation of Gene Expression:- 1. Introduction to Regulation of Gene Expression 2. The Lac Operon 3. Bacteriophage Lambda (λ) 4. Gene Amplification during Development of Metazoans 5. Immunoglobulin Gene Rearrangement 6. Regulation of Messenger RNA Stability Provides another Control Mechanism. Contents: Essay on Introduction to Regulation of Gene Expression Essay on the Lac Operon Essay on the Bacteriophage [...]