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The book entitled “Principles of Biometrical Genetics” is prepared to serve as a text book for M.Sc. (Ag.) students. The book is written in simple language and even complex terms have been reduced for easy understanding. Hope this textbook would be useful for post graduate students, teachers and researchers engaged in the field of Genetics and Plant Breeding.

Contents: Preface. 1. Introduction. 2. Multiple Factor hypothesis. 3. Biometrical Techniques in Plant Breeding.4. Analysis of Continuous Variation. 5. Analysis of Variance. 6. Analysis of Covariance. 7. Variation Associated with Polygenic Traits. 8. Correlation Coefficients. 9. Path Coefficient Analysis. 10. Gene Action. 11. Variance Components of Quantitative Trait. 12. Heritability and Genetic Advance. 13. Correlated Response. 14. Discriminant Function and Selection Index. 15. Metroglyph Analysis. 16. D2 Analysis. 17. Principal Component Analysis. 18. Factor Analysis. 19. Combining Ability. 20. Top Cross or Inbred-variety Cross. 21. Polycross Design. 22. Line x Tester Analysis. 23. Diallel Analysis (Hayman’s Graphical Approach). 24. Diallel Analysis (Griffing’s Approach).25. Partial Diallel Anaysis. 26. Triallel and Quadriallel Analysis. 27. Quadriallel Analysis. 28. Biparental Cross Analysis. 29. Transformation of Data. 30. Generation Mean Analysis. 31. Heterosis and Inbreeding Depression. 32 Significance of Gene Action. 33. Stability Analysis. 34. Transgressive Segregation. References.