The known evolutionary relationships among eight Avida lineages evolved with recombination for 100 generations along each branch. Super-imposed along this phylogeny is the identity of every mutation that became fixed in the population, ie was eventually possessed by each member. In red are mutations that arose and became fixed along a single branch; in blue are those that became fixed on a subsequent branch, with a dashed line indicating a loss of the mutation in the sister population. For example, C257S (along the top left branch) denotes that the instruction C at genomic location 257 mutated to S around generation 20 and became fixed at generation 90.
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