Justifications for the development and use of MAS in plant breeding fall into four broad areas that are relevant to almost all target crops. These are: a. Traits that are difficult to manage through conventional phenotypic selection because they are expensive or time consuming to measure, or have low penetrance or complex inheritance. b. Traits whose selection depends on specific [...]
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 [...]