This article throws light upon the following three main types of gene action. The types are: 1. Additive Gene Action 2. Dominance Gene Action 3. Epistasis. Type # 1. Additive Gene Action: When the genes act in such a way that substitution of one allele for another produces same plus or minus effect regardless of other gene (s) and the [...]
After reading this article we will learn about the Hardy-Weinberg equilibrium of gene. In a large random mating population, both gene and genotype frequencies remain constant from generation to generation, in absence of migration, mutation and selection. These properties of a population were first demonstrated by Hardy and Weinberg independently in 1908, and are generally known as Hardy-Weinberg law. If [...]
In this article we will discuss about:- 1. Selection of Disease Resistant Variants at the Plant Level 2. Selection in Vitro with Toxins and Culture Filtrates against Diseases 3. Selection for Resistance to Drought and Flooding 4. Selection for Salt Tolerance. Selection of Disease Resistant Variants at the Plant Level: One approach to utilise somaclonal variation is to screen regenerated [...]