Evolution of sex.  I. Primitive sex.
D000483:Alleles; D005075:Biological Evolution; D002455:Cell Division; D002459:Cell Fusion; D002875:Chromosomes; D004171:Diploidy; D005838:Genotype; D008540:Meiosis; D008954:Models, Biological; D009154:Mutation; D010641:Phenotype; D014176:Protein Biosynthesis; D011995:Recombination, Genetic; D012641:Selection, Genetic; D012723:Sex