The concept of combining ability was developed by G.F. Sprague and L.A. Tatum in 1942. The average or overall performance of a line in a series of crosses is known as general combining ability (gca) and the deviation in the performance of a particular cross than what would be expected based on the gca effects […]
After reading this article you will learn about the genetic components of variation from a diallel analysis. The methods of estimating genetic components of variation and their proportions were given by B.I. Hayman in 1954. These components and proportions are as follows: D = Additive variation. F = Measures the relative frequency of dominant and […]
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 […]
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