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The ZO sex-determination system is a system that determines the sex of offspring in caddisflies and several moths. In those species, there is one sex chromosome, Z. Males have two Z chromosomes, whereas females have one Z. Males are ZZ, while females are ZO.[1][2][3] The ancestor of Lepidoptera and Trichoptera had ZO sex determination, which became a ZW sex-determination system in the largest clade, Ditrysia, as well as in Tischerioidea. Some of the ZW species later reverted to the ZO system.[1]
- ^ a b Traut, W.; Sahara, K.; Marec, F. (2007). "Sex Chromosomes and Sex Determination in Lepidoptera". Sexual Development. 1 (6): 332–346. doi:10.1159/000111765. PMID 18391545. S2CID 6885122.
- ^ "Genetic Mechanisms of Sex Determination - Learn Science at Scitable". www.nature.com.
- ^ Handbuch Der Zoologie / Handbook of Zoology. Walter de Gruyter. 1925. ISBN 9783110162103 – via Google Books.