Apply the general viability selection model to answer the following hypothetical

Question

Apply the general viability selection model to answer the following hypothetical problem. In the plant Clarkia tembloriensis, temporal variation in germination date is under the control of a single locus. In dry habitats where pollinators are not abundant, the early germinating, recessive genotype (ll) is favored over the late germinating genotypes (LL and Ll). Assume the following data come from a population in a dry habitat and that zygotes are formed by random mating prior to selection.
Genotype: LL Ll ll
Number before selection 36 48 16
Number after selection 24 32 14

What is the genotypic-specific survivorship for this population?

What are the genotype-specific relative fitnesses?

What are the genotype-specific selection coefficients?

What form of selection is indicated by the fitnesses of genotypes at this locus?

What mode of inheritance is indicated by the fitnesses at this locus?

Calculate population mean fitness (w-bar)

Explanation / Answer

survivorship has shifted to ll genotype after selection

fitnesses are simply each survival rate divided by the highest survival rate. genotype specifc relative fitness for ll is 0.58

genotype-specific selection coefficients is 1-w where w is the adaptability. 1-0.58=0.41

negative selection is indicated by the fitnedd of the genotype at this locus due to selection in favour of recessive genotype

w is again can be calculated by 1-s.1-0.41=0.58

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