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Sex determination in Sarotherodon (tilapia)

Part 2: the sex ratio as a tool for the determination of genotype — a model of autosomal and gonosomal influence

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Summary

The simplest possible model of the sex determination process adding autosomal influence to a minimal number of sex chromosomes was developed to explain matings of Tilapia (Sarotherodon) species. Eighteen different genotypes, each having two autosomes (AA, Aa, or aa) and two sex chromosomes (WX, WY, WW, XY, XX or YY) involved in sex determination, are predicted by the theory. Their sex (10 males and 8 females) were determined using a series of directed graphs, showing the relative strength of the chromosome pairs, developed on the basis of Chen's sex ratio results (Chen 1969). This theoretical model predicts eight different sex ratios (0∶1, 1∶3, 3∶5, 1∶1, 9∶7, 5∶3, 3∶1, 1∶0 ♀∶♂); three of them are not predicted by the WXYZ theory. The greatest part of these sex ratios have been obtained experimentally in extensive series of crosses between related species of Tilapia and their hybrids, carried out by several authors. The theory succeeds in explaining all of Chen's results, including those ratios 5∶3 and 0∶1 seen in certain crosses but not predicted by the WXYZ theory. The importance of the autosomes is seen in comparisons of the genotype pairs (AaWY, aaWY), (AaXY, aaXY) and (AAWW, AaWW) in which the first genotype in each case is male while the second is female as proven by the sex ratio results. The members of the pair differ only in the substitution of one autosome for the other. To test the theory, experiments consisting of hormonal sex reversion and a series of crosses are proposed. Finally, theoretical and practical implications of the theory are discussed.

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Literature

  • Anders, A.; Anders, F: Genetisch bedingte XX- und XY-♀♀ und YY-♂♂ beim wilden Platypoecilus maculatus aus Mexiko. Z. Vererbungslehre 94, 1–18 (1963)

    Google Scholar 

  • Avtalion, R.R.; Hammerman, I.S.: Sex determination in Sarothe-rodon (Tilipia). I. Introduction to a theory of autosomal influence. Bamidgeh 30, 110–115 (1978)

    Google Scholar 

  • Bellamy, A.W.: Inter-specific hybrids in Platypoecilus: one species ZZ-ZW, the other XY-XX. Proc. Nat. Acad. Sci. (USA) 22, 531–535 (1936)

    Google Scholar 

  • Chen, F.Y.: Preliminary studies on the sex-determining mechanism of Tilapia mossambica Peters and T. hornorum Trewavas. Verh. Intern. Ver. Limnol. 17, 719–724 (1969)

    Google Scholar 

  • Clemens, H.P.; Inslee, T.: The production of unisexual broods by Tilapia mossambica sex-reversed with methyltestosterone. Transact. Am. Fish. Soc. 97, 18–21 (1968)

    Google Scholar 

  • Dzwillo, M.; Zander, C.D.: Geschlechtsbestimmung und Geschlechtsumstimmung bei Zahnkarpfen (Pisces). Mitt. Hamburg. Zool. Mus. Inst. 64, 147–162 (1967)

    Google Scholar 

  • Fishelson, L.: Cichlidae of the genus of Tilapia in Israel. Bamidgeh 18, 67–89 (1966)

    Google Scholar 

  • Goldschmidt, R.B.: Theoretical Genetics. Berkeley: Univ. of California Press 1955

    Google Scholar 

  • Gordon, M.: Interchanging genetic mechanisms for sex determination in fishes under domestication. J. Hered. 37, 307–320 (1946)

    Google Scholar 

  • Gordon, M.: Genetics of Platypoecilus maculatus. IV. The sex determining mechanism in two wild populations of the Mexican platyfish. Genetics 32, 8–17 (1947)

    Google Scholar 

  • Guerrero, R.D. III: Use of oral androgens for the production of all male Tilapia aurea (Steindachner). Transact Am. Fish. Soc. 104, 342–348 (1975)

    Google Scholar 

  • Hickling, C.F.: The Malacca Tilapia hybrids. J. Genet. 57, 1–10 (1960)

    Google Scholar 

  • Hickling, C.F.: The cultivation of Tilapia. Sci. Am. 208, 143–152 (1963)

    Google Scholar 

  • Jalabert, B; Kammacher, P.; Lessent, P.: Déterminisme du sexe chez les hybrides entre Tilapia macrochir et Tilapia nilotica. Etude de la sex-ratio dans les recroisements des hybrides de première génération par les espèces parentes. Ann. Biol. Anim. Bioch. Biophys. 11, 155–165 (1971)

    Google Scholar 

  • Jalabert, B.; Moreau, J.; Planquet, P.; Billard, R.: Déterminisme du sexe chez Tilapia macrochir et Tilapia nilotica: Action de la méthyltestosterone dans l'alimentation des alevins sur la differenciation sexuelle: Proportion des sexes dans la descendance des mâles ‘inversés’. Ann. Biol. Anim. Bioch. Biophys. 14, 729–739 (1974)

    Google Scholar 

  • Kallman, K.D.: Genetics and geography of sex determination in the poeciliid fish, Xiphophorus maculatus. Zoologica 50, 151–190 (1965)

    Google Scholar 

  • Kallman, K.D.: Evidence for the existence of transformer genes for sex in the teleost Xiphophorus maculatus. Genetics 60, 811–828 (1968)

    Google Scholar 

  • Kosswig, C.: Polygenic sex determination. Experientia 20, 1–10 (1964)

    Google Scholar 

  • Kosswig, C.; Öktay, M.: Die Geschlechtsbestimmung bei den Xiphophorini (Neue Tatsachen und neue Deutungen). Istanbul Univ. Fen. Fak. Hidrob. B2, 133–156 (1955)

    Google Scholar 

  • Nakamura, M.; Takahashi, H.: Gonodal sex differentiation in Tilapia mossambica, with special regard to the time of estrogen treatment effective in inducing complete feminization of genetic males. Bull. Fac. Fish. Hokkaido Univ. 24, 1–13 (1973)

    Google Scholar 

  • Öktay, M.: Über Ausnahmemännchen bei Platypoecilus maculatus und eine neue Sippe mit XX-Männchen und XX-Weibchen. Istanbul Univ. Fen Fak. Mecm. B24, 75–91 (1959)

    Google Scholar 

  • Pruginin, Y.; Rothbard, S.; Wohlfarth, G.; Halevy, A.; Moav, R.; Hulata, G.: All male broods of Tilapia nilotica x T. aurea hybrids. Aquaculture 6, 11–21 (1975)

    Google Scholar 

  • Winge, Ö.: The experimental alteration of sex chromosomes into autosomes and vice versa, as illustrated by Lebistes. C.R. Lab. Carlsberg, Sér. Physiol. 21, 1–49 (1934)

    Google Scholar 

  • Winge, Ö.; Ditlevsen, E.: Colour inheritance and sex determination in Lebistes. C.R. Lab. Carlsberg, Sér. Physiol. 24, 227–248 (1948)

    Google Scholar 

  • Yamamoto, T.: Induction of reversal in sex differentiation of YY zygotes in the medaka, Oryzias latipes. Genetics 48, 293–306 (1963)

    Google Scholar 

  • Yamamoto, T.: Sex differentiation. In: Fish Physiology, Vol. 3, (eds. Hoar, W.D.; Randall, D.J.), pp. 117–135. New York-London: Acad. Press 1969

    Google Scholar 

  • Yamamoto, T.: A YY male goldfish from mating estrone-induced XY female and normal male. J. Hered. 66, 2–4 (1975)

    Google Scholar 

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Authors and Affiliations

  1. Department of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel

    I. S. Hammerman & R. R. Avtalion

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  1. I. S. Hammerman
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  2. R. R. Avtalion
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Communicated by A. Robertson

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Hammerman, I.S., Avtalion, R.R. Sex determination in Sarotherodon (tilapia) . Theoret. Appl. Genetics 55, 177–187 (1979). https://doi.org/10.1007/BF00295445

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  • DOI: https://doi.org/10.1007/BF00295445

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