Slections
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At an average environmental temperature of 10OC the optimum
fur length for survival is 15 mm. this is the mean fur length of the population, with a number of
individuals distributed either side of it.
If the average environmental temperature falls to 5oC, individuals
with longer fur will be better insulated from the cold. These individuals are
more likely to survive and so produce offspring. Those with shorted fur are less likely to survive and so produce
fewer offspring.
Over many generations, the mean fur length of the population increases as more
individuals with longer fur survive, and more individuals with shorter fur die from the cold. The proportion of alleles in the population for longer fur is increasing at
the expense of those for shorter fur.
Over further generations, the shift in mean fur length continues until it
reaches the optimum.