Two experiments were mentioned in the talk: one that tested food preference in caterpillars, and another that tested for egg-laying preferences in adult
butterflies. what were the results of those two experiments, and what did those results

Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.