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Chapter 8: Selection response

Chapter 8: Selection response. Selection differences and –intensity. Selection response. Selection difference Selection intensity Selection respons Heritability of threshold traits Breeding value for threshold traits Genetic correlation Changes in correlated traits.

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Chapter 8: Selection response

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  1. Chapter 8: Selection response Selection differences and –intensity

  2. Selection response • Selection difference • Selection intensity • Selection respons • Heritability of threshold traits • Breeding value for threshold traits • Genetic correlation • Changes in correlated traits

  3. Selection difference, S S = PS - P

  4. Selection intensity, i i = S/sP

  5. Selection intensity table

  6. Selection response, G individual selection R = G = h2 S = h2 i P = h i A or G = (IS – A)

  7. Selection response, G i = Selection intensity rAI = Accuracy A = Additiv genetic standard error L = Generation interval

  8. Extended formula for G general formula

  9. Threshold traits

  10. Heritability estimates for threshold traits

  11. Threshold traitsscale problems

  12. Threshold traitsDistribution of hip dysplasia (HD) in German Shepherd dogsB1 and more normal, B2 and under HD

  13. Threshold traits

  14. Calculation of an index, I, for a threshold trait

  15. Genetic correlation and change in secondary traits • Pleiotropy • Linkage

  16. Example of negative genetic correlation A1 A2

  17. Determination of genetic correlation by selection experiments Gy / Ay r Ax,Ay = Gx / Ax Correlated change in trait y by selection for trait x

  18. The genetic correlation is dynamic

  19. Correlation between fitness and selected traits

  20. Genetic correlation: Examples

  21. Back lash on a genetic level -maximal fitness

  22. Auto selection for litter size

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