natural selection
fittest genotypes- highest average lifetime reproductive success (may live longer, may produce more offspring each time they reproduce)
components of fitness
viability (probability of surviving to reporductive age)
fertility (number of offspring that survive to reporductive age)
fitness (product of viability and fertility for all individuals of a given genotype)
selection coefficient
s=1-w
to calculate absaloute fitness of each genotype
divide by the fittest of the fittest genotype
local adaptation- alleles
may have different effects on fitness under different environmental conditions
local adaptation- genetic differences between populations
may be important for the percistance of those populations