Let us make an in-depth study of the polymerase chain reaction, which is a technique for amplifying DNA sequences. The below given article will help you to understand the following things:- 1. Polymerase Chain Reaction Amplifies Specific Regions of DNA 2. Performing a Polymerase Chain Reaction 3. Taq Polymerase Simplifies and Improves the Polymerase Chain Reaction and Others. The polymerase [...]
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 Mendel's tri-hybrid and multi-hybrid crosses. Mendel extended his observations to tri-hybrid crosses involving three pairs of contrasting characters. The characters he considered were: seed shape—smooth (S) vs. wrinkled (s); colour of cotyledons—yellow (Y) vs. green (y); and flower colour—violet (V) vs. white (v). The F1 hybrid produces 8 types of gametes. These [...]