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 [...]
After reading this article we will learn about the consequences and co-efficient of inbreeding. The mating of individuals more closely related than individuals mating at random is known as inbreeding. The most intense form of inbreeding is selfing. Consequences of Inbreeding: (i) Reduction in genetic variance within a small population (ii) General decrease in over-all heterozygosity (iii) Differentiation of a [...]