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Published online 1 March 2007
Published in Crop Sci 47:467-474 (2007)
© 2007 Crop Science Society of America
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The Genetic Structure of a Maize Population: The Role of Dominance

Brandon M. Wardyna, Jode W. Edwardsb,* and Kendall R. Lamkeyc

a AgReliant Genetics LLC, 1620 Hwy. 10, Gibbon, NE 68840
b USDA-ARS CICG, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011. Part of a dissertation submitted by B.M. Wardyn in partial fulfillment of the requirements for the Ph.D. degree


Figure 1
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  		Figure 1. A diagram representing the mating design used for estimation of the genetic covariance parameters. Ovals encompass the generations used in the analysis.

 

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  		Figure 2. Values of the {sigma}D2, D1, and D2* expressed as a relative percentage of the respective {sigma}A2 for six environments and the combined analysis for grain yield and plant height.

 

Figure 3
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  		Figure 3. Line graphs representing the comparison of observed (solid lines) genetic variances and predicted (dotted lines) genetic variances using the estimated genetic covariance parameters for plant height, ear height, grain yield, grain moisture, days to mid pollen (pollen date measured in days after planting [DAP]) and days to midsilk (silk date, measured in DAP) versus generation of inbreeding. Generations: TC1, topcrosses of S1 lines; TC5, topcrosses of S5 generation. S1, S3, and S5 are the inbred generations per se. Standard error bars represent one standard deviation.

 




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