Haplodiploid sex determination is prevalent in nature comprising about 25% of higher taxa. Due to its uniqueness, selfish entity may relatively easily slip in the system. Here, I will introduce 3 different types of selfish entities. First, some microorganisms are known to distort sex ratio in favor of their own prosperity. Second, a genetic fragment, called paternal sex ratio chromosome, is classified as the extremely selfish element so far in haplodiploid. Finally, haploid genome itself can evolve selfishness. The first two result in skewed sex ratio, and the last in completely new genetic relatedness. I will also discuss their evolutionary significance and potential utilization in controlling pest populations.

• Gilsang Jeong(Division of Basic Research, National Institute of Ecology, Koreaa)
• Soyeon Park(Division of Basic Research, National Institute of Ecology, Koreaa)
• Jae Yeon Kang(Division of Basic Research, National Institute of Ecology, Koreaa)
• In Jung An(Division of Basic Research, National Institute of Ecology, Koreaa)