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Science 21 December 1979:
Vol. 206. no. 4425, pp. 1410 - 1412
DOI: 10.1126/science.92052
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Articles

Science, Vol 206, Issue 4425, 1410-1412
Copyright © 1979 by American Association for the Advancement of Science

articles

Derived X chromosome in the turtle genus Staurotypus

JW Sites Jr, JW Bickham, and MW Haiduk

C-banding, G-banding, and silver (Ag-AS) staining techniques reveal a distinctive sex chromosome system in the turtle Staurotypus salvinii. Unlike previously described systems in most other vertebrate groups in which the Y or W is derived and the homogametic sex represents the primitive condition, the reverse is true for S. salvinii. The X chromosome is derived; thus the homogametic sex (female) is more derived than the heterogametic sex. The male is intermediate between the female and the ancestral condition observed in other turtle species. Staurotypus does not confirm to the general model of sex chromosome evolution for diploid dioecious organisms.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)