Before revision:  First, what are the conditions under which sexual reproduction is advantageous over asexual reproduction? Second, what are the conditions under which sexual dimorphism, the presence of two phenotypically distinct sexes , is advantageous?
After revision:  First, what are the conditions under which sexual reproduction is advantageous and can evolve in the context of autocorrelated or directionally varying environments, mutational biases, spatial heterogeneities and phenotypic plasticity. Our results generalize and unify previous analyses. We also examine the proposal made by Geodakyan that the presence of two phenotypically distinct sexes , is advantageous?