A note on the evolution of sexual dimorphism.
D005075:Biological Evolution; D002465:Cell Movement; D005260:Female; D005838:Genotype; D008297:Male; D008954:Models, Biological; D010063:Ovum / Q000166:cytology; D012098:Reproduction; D012727:Sex Characteristics; D013094:Spermatozoa / Q000166:cytology