Karyological evidence of female heterogamety in the musquitofish, Gambusia affinis
Chen, T.R.; Ebeling, A.W. (1968). Karyological evidence of female heterogamety in the musquitofish, Gambusia affinis. Copeia 1968(1): 70-75
In: Copeia. American Society of Ichthyologists and Herpetologists: New York, N.Y., etc.. ISSN 0045-8511; e-ISSN 1938-5110, more
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| Keywords |
Fishes > Osteichthyes > Cyprinodontiformes > Poeciliidae > Gambusia > Gambusia affinis
Marine/Coastal |
| Abstract |
In both sexes of the mosquitofish Gambusia affinis, a constant diploid chromosome number of 48 was observed in squashes of gill epithelium, testes, and spleen. The female karyotype invariably includes a single distinctly large metacentric chromosome, absent in all males examined, which strongly indicates female heterogamety of the "WZ" type. The smallest acrocentric, also without a homomorph, probably complements this large W; in the male the smallest pair of similar acrocentrics (ZZ?) forms an atypical meiotic bivalent. The cytological expression of digamety in teleostean fishes is briefly discussed. |
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