This is a draft cheat sheet. It is a work in progress and is not finished yet.
ΔG or R is due to:
1. artificial selection among ADULTS of parent generation |
2. natural differences in FERTILITY among individuals of PARENT generation |
3. natural differences in VIABILITY among individuals of OFFSPRING generation |
response to selection (R) |
= change in population mean due to selection |
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= mean phenotypic value of offspring generation — mean of whole parental generation before selection |
measure of selection applied = selection differential = S |
= mean phenotypic value of individuals selected as parents |
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= expressed as a deviation from the population mean |
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Selection
process in which certain individuals in a population are preferred to others for the production of the next generation |
does not create new genes |
AIM: |
to increase f (desirable genes) |
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to decrease f (undesirable genes) |
FORMS: |
on the basis of phenotype |
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on the basis of breeding value |
Basic Effect: |
on the basis of breeding value |
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changes the array of gene frequencies (although almost completely hidden) |
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→ can be observed through changes in the MEAN |
How to Describe Change: |
compare successive generations at the same point in the life cycle of the individuals |
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