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...2 Distance from the Mediterranean coast plotted against frequency of the ester1 allele in mosquito populations in the south of France in the 1970s. Activity 1 In which populations was the ester1 allele most common in each of the years shown? Answer In all three years, the ester1 allele frequency was highest in the populations closest to the coast. Activity 2 Describe how...

...2 A moving object, viewed with one eye brighter than the other, appears either in front of or behind the true track, depending upon direction of motion. Figure 2 shows the effect of giving one eye a bright view and the other a dim view of a moving object. As explained, the dim eye will produce a slightly delayed signal, compared with the bright eye (which itself must take...