Populations of the moth Biston betularia live in Europe and in North America. The most common phenotype on both continents is a pale wing colour with light-grey shading (the typical form). A moth phenotype with dark wing colour (the melanic form) also occurs on both continents. Fig. 10.1 shows the typical form of the moth. Fig. 10.2 shows the melanic form of the moth. Fig. 10.1 Fig. 10.2 A light trap was used to estimate the total size of a population of $$\(B\)$$. betularia in a woodland. On night one, 24 moths were captured. These were marked with a small spot of harmless paint. On night two, 29 moths were captured, and 8 of these showed a spot of paint. Use the Lincoln index formula provided to calculate the size of the population. Show your working. population size $$\(=\)$$ .....................................................

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