Author
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Darrah, Larry |
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Submitted to: Meeting Abstract
Publication Type: Abstract Only Publication Acceptance Date: 9/19/1996 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Diallel analysis is widely used in breeding programs to estimate genetic effects for a fixed set of lines or to determine relative proportions of general (GCA) and specific combining ability (SCA) variances. Variances for GCA and SCA can be equated to additive and nonadditive variances, respectively, to examine modes of inheritance where a random-entry model is assumed. Analysis of a diallel is laborious by hand because of the necessity of carrying several decimal places for all numbers to insure the sumchecks are exactly 0.0 instead of just close, in which case an error may have been made. Although diallel analysis can be done by using the commercial Statistical Analysis System, I have found it to be simpler to use a spreadsheet, such as Lotus 123, Excel, or Quattro. If the spreadsheet is designed correctly, it is a simple procedure to cut an eight-parent diallel down to fewer parents. Thus, develop spreadsheet templates for the larger sizes and then cut them down where necessary. An eight-parent, Method 4 diallel (crosses only) will be shown as an example to demonstrate development and application of a spreadsheet template for diallel analysis. |
