In this article we will discuss about the mechanism of eukaryotic gene expression, particularly in humans. 1. In multicellular organism, each cell expresses a subset of its genes. 2. A cell expresses different genes depending on its growth state or environment. 3. Sometimes gene transcripts are spliced differently in different cells. 4. Each gene carries not only structural information but [...]
In this article we will discuss about the features and effects of gene. Essential Features of Gene: Prior to 1940, recombination was not believed to occur within genes. The genes in a chromosome were considered analogous to beads on a string. Recombination was believed to occur only between the beads or genes. The gene was not considered subdivisible. But, on [...]
The following points highlight the top five criteria for genetic polymorphism. They are: 1. Selection 2. Mutation and Mutation Rates 3. Genetic Drift 4. Migration Pressure or Gene Flow 5. Meiotic Drive. Criteria # 1. Selection: Selection is the non-random or selective reproduction of genotypes. The elucidation of the selective forces which may have given rise to any particular polymorphism [...]