Dictionary of Human Evolution and Biology

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Haplodiploidy

Mode of sex determination in which males are derived entirely from unfertilized haploid eggs and females from diploid, usually fertilized, eggs. Common in certain insects such as the Hymenoptera (four-winged wasps, bees, ants, etc.). Such systems are of interest to scientists who entertain hypotheses that attempt to relate certain social behaviors and systems to degree of relatedness.

See sociobiology and haplodiploid hypothesis.