assortative mating, masculinization, copulatory, hermaphroditism, homozygosity, gametophyte, epistasis, ontogeny, swordtails, introgression, polygyny, estrous cycle, intraspecific, sociality, stereotypy, fru, meadow vole, laterality, zebra finch, asexual reproduction, demodex, placental mammal, lateralisation, polistes, hairlessness, transitivity, masculinisation, gonadal, lateralization, oestrus, flatfishes, eyespots, gendering, pelage, symbioses, fusiform, coevolution, mosaicism, striated muscle, conceptus, phenotype, multicellularity, subgenus, corpus luteum, neoteny, polyandry, metazoans, bilaterally symmetrical, monozygotic, prairie vole, hindbrain, morphogen, placentals, relatedness, morphogenesis, mus musculus, bacteroides, pan troglodytes, mole rat, trichinella, lipin, vermis, phyla, xenopus laevis, carnivora, leydig cell, outcrossing, anaerobes, xenopus, cavefish, prokaryotes, papillomas, syrinx, y chromosome, asexuality, physiologies, faunas, plexiform, females, volvox, hamartoma, chordate, flatworm, motile, superior colliculus, vocalisation, estrous, stochasticity, teleost fish, baculum, phylogenies, cichlids, ecotypes, habilis, paranthropus, endogamy, habituation, pipefish, agouti, mammalia, monotremes, homologues, asymmetry, differences, homology, lability, asymmetries, dissimilarities, dissimilarity, plasticity, predilection, seasonality, similarity, affinity, hysteresis, preponderance, variability, decrement, discontinuity, divergence, heterogeneity