Sex and sexual selection: evolution of sex, what is sex genotype of another locus (ex. A: main point: recombination (which presumably has an advantage, linkage equilibrium genotype of one locus (ex. B) is independent of: linkage disequilibrium genotype of one locus (ex. B) is not: halotype the multilocus genotype of a chromosome/gamete independent of genotype of another locus (ex. In a population, males are not that useful: cost: too many males, recombination, breaks down adaptive genes complexes, only half as related to offspring, cost: genetic component, finding mates. Increase energy use and change of predation/parasitism: ex. Snails are parasitized by worms, which eat parasites their gonads thus turning them sterile and make them behave differently, like getting eaten by birds on purpose. Female kiwi: one egg is 15-20% of body weight, ex. Peacocks: peahen and chicks are drab colored, peacocks males are very colorful and attractive, test, differential parental investment dictates which sex is choosy, ex.