selection differences and –intensity chapter 8: selection response
TRANSCRIPT
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Selection differences and –intensity
Chapter 8: Selection response
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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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S = PS - P
Selection difference, S
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i = S/P
Selection intensity, i
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Selection intensity table
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Selection response, G individual selection
R = G = h2 S = h2 i P
= h i A
or
G = (IS – A)
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Selection response, G
i = Selection intensity
rAI = Accuracy
A = Additiv genetic standard error
L = Generation interval
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Extended formula for G general formula
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Threshold traits
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Heritability estimates for threshold traits
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Threshold traitsscale problems
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Threshold traitsDistribution of hip dysplasia (HD) in German Shepherd
dogsB1 and more normal, B2 and under HD
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Threshold traits
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Calculation of an index, I, for a threshold trait
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Genetic correlation and change in secondary traits
• Pleiotropy
• Linkage
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Example of negative genetic correlation
A1
A2
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Determination of genetic correlation by selection
experiments
r Ax,Ay =Gy / Ay
Gx / Ax
Correlated change in trait y by selection for trait x
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The genetic correlation is dynamic
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Correlation between fitness and selected traits
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Genetic correlation: Examples
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Back lash on a genetic level -maximal fitness
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Auto selection for litter size