Back نسبة الجنس Arabic Relació entre sexes Catalan Poměr pohlaví Czech Geschlechterverteilung German Seksa proporcio Esperanto Proporciones sexuales Spanish نسبت جنسی Persian Sex-ratio French लिंग अनुपात Hindi Indice di mascolinità Italian
A sex ratio is the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically about 1:1 in species which reproduce sexually.[1][2] However, many species deviate from an even sex ratio, either periodically or permanently. These include parthenogenic and androgenetic[3] species, periodically mating organisms such as aphids, some eusocial wasps, bees, ants, and termites.[4]
- ^ Fisher RA (1930). The Genetical Theory of Natural Selection. Oxford: Clarendon Press. pp. 141–143 – via Internet Archive.
- ^ Hamilton WD (April 1967). "Extraordinary sex ratios. A sex-ratio theory for sex linkage and inbreeding has new implications in cytogenetics and entomology". Science. 156 (3774): 477–488. Bibcode:1967Sci...156..477H. doi:10.1126/science.156.3774.477. JSTOR 1721222. PMID 6021675.
- ^ Schwander T, Oldroyd BP (28 Sep 2008). "Androgenesis: where males hijack eggs to clone themselves".
- ^ Kobayashi K, Hasegawa E, Yamamoto Y, Kawatsu K, Vargo EL, Yoshimura J, et al. (2013). "Sex ratio biases in termites provide evidence for kin selection". Nature Communications. 4: 2048. Bibcode:2013NatCo...4.2048K. doi:10.1038/ncomms3048. hdl:2123/11211. PMID 23807025.