Experiment 2: Effects of Different Population History
Fish used in this experiment were collected from three source
populations after they had been reared for six generations. As
expected from HardyeWeinberg predictions, the first generation
produced by the hemizygous red parents contained 75% red individuals.
Across the six generations, the three populations used in
this experiment had diverged in morph frequency: one population
had increased from 75% red morphs in the F1 generation to 88% red
morphs (referred to below as the ‘red-morph population’); the
second population had declined from 75% red morphs to 8% red
morphs (referred to below as the ‘normal-morph population’); the
third population had declined from 75% red morphs to 50% red
morphs (referred to below as the ‘equal-morph population’).
The adults collected were directly used in association tests.