Über die Vererbung von Y-gebundenen Farbgenen des Xiphophorus pygmaeus nigrensisRosen (Pisces)
- Cite this article as:
- Zander, C.D. Molec. Gen. Genet. (1968) 101: 29. doi:10.1007/BF00434809
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The inheritance of two Y-linked colour genes of the Poecillid Xiphophorus pygmaeus nigrensis has been described. Males with the gene Fl (=flavus) posess a yellow colouration of the body whereas those with the gene Vfl (= venter flavus) only at the basis of the anal ray. These patterns depend on G-xanthophores, yellow pigment cells with colourless granulation (Öktay).
Cross-breedings with X. maculatus and X. milleri cause an intensification of the patterns by increase of the number of the G-xanthophores and their transformation into xanthoerythrophores (colour cells with red granulation). Backcross males with X. maculatus inheriting Fl or Vfl show a red colouration of the whole body.
These results may be explained by the theory of Kosswig, Gordon and Öktay of polygenic modifier systems. Their function is to regulate the number, the intensity and the grade of pigment cells, while the colour gene activates this process of establishing the pattern and determines the center of it. Modifiers in X. pygmaeus nigrensis changing G-xanthophores into xanthoerythrophores are below a genetic level or absent.