Parent phenotypes, offspring phenotypes, and expected frequencies of right-bending (R) and left-bending (L) forms of the scale-eating cichlid fish Perissodus microlepis. Each box represents offspring from a single cross (except rows (a) and (b), where results are pooled from all crosses in that study). Offspring were obtained as broods defended by brooding parents in the field. Parent and offspring phenotypes were scored visually, except in row (c) where offspring phenotypes were measured and parent phenotypes inferred from putative microsatellite markers for right- and left-bending. Colors indicate statistically significant departures from expectations for Model I (orange box), Model II (yellow box), or both Models I and II (blue box). Parent phenotypes follow the original convention of Hori , who referred to right- and left-bending as dextral and sinistral. This convention differs from , who follow the later convention of referring to right-bending fish as 'lefties' because they attack prey from the left side . In regard to Model II, if the RR genotype is lethal as proposed in , then all right-bending parents (R) must be RL heterozygotes.