ZO sex-determination system

Biological system in certain moths

Sex
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Biological terms
Sexual dimorphism Sexual differentiation Feminization Virilization Sex-determination system XY XO ZW ZO Temperature-dependent Haplodiploidy Heterogametic sex Homogametic sex Sex chromosome X chromosome Y chromosome Testis-determining factor Hermaphrodite Sequential hermaphroditism Simultaneous hermaphroditism Intersex (biology) Mating type
Sexual reproduction
Evolution of sexual reproduction Anisogamy Isogamy Germ cell Meiosis Gametogenesis Spermatogenesis Oogenesis Gamete spermatozoon ovum Fertilization External fertilization Internal fertilization Sexual selection Plant reproduction Fungal reproduction Sexual reproduction in animals Sexual intercourse Penile-vaginal intercourse Copulation Human reproduction Lordosis behavior Pelvic thrust
Sexuality
Plant sexuality Animal sexuality Human sexuality Mechanics Differentiation Activity
Sexual system
Dioecy Gonochorism Hermaphrodite
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The ZO sex-determination system is a system that determines the sex of offspring in 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]

References

^ 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.