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    Proc Natl Acad Sci U S A. 2005 Oct 25;102(43):15518-22. Epub 2005 Oct 17.

    Molecular signatures for sex in the Placozoa.

    Signorovitch AY, Dellaporta SL, Buss LW.

    Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06511, USA. ana.signorovitch@yale.edu

    Placozoans, the simplest free-living animals, have never been observed to reproduce sexually. Here, we describe molecular evidence for sexual reproduction within one clade of the Placozoa. In a population sample of 10 individuals, within-individual and overall nucleotide diversity were similar to each other and consistent with levels observed in sexually reproducing species. Intergenic recombination as well as the sharing of alleles between heterozygous and homozygous individuals was also observed. These hallmarks of sexual reproduction establish that sex is indeed present in this phylum.

    PMID: 16230622 [PubMed - indexed for MEDLINE]

    PMCID: 1266089

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