Figure 1.
Allele phylogenies (top) for four diploid individuals designated A, B, C, and D and bars (bottom) depicting the constitution of each individual. 1, complete asexuality. Individuals descend from an ancient diploid ancestor in which sex was lost, giving rise to lineages 1 and 2. All alleles diverge independently so that for any two individuals the phylogenetic distance between a sequence in one individual and its homolog in the other will be the same for all their sequences. 2, asexuality with conversion (red) in individual A. 3, asexuality with homologous genetic transfer of an allele (red) from individual C to individual B. 4, a cross between heterozygotes a1/a2 and a3/a4. Each individual in the F1 shares one of its alleles at each locus with a second individual and shares its homolog with a third individual.