After reading this article we will learn about the estimation of additive and dominance variance. Additive (D) and dominance (H) genetic variances are easily computed with the help of following formulae. In some nomenclatures additive variance is denoted by A and dominance by H. where, V = Variance, ½ D = additive genetic variance, 1/4H = dominance variance, and VE [...]
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 of the lines involved is [...]
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 recessive alleles in the parents. [...]