Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- genetik:haarfarbe_tyr [2026/06/21 10:51] – [Zur Vererbung] kathrin
+++ genetik:haarfarbe_tyr [2026/06/21 10:58] (aktuell) – [Zur Vererbung] kathrin
@@ Zeile 47: / Zeile 47: @@
 Castle //et al//., 1909((Castle, W. E., Walter, H. E., Mullenix, R. C., & Cobb, S. 1909. Studies of inheritance in rabbits. Carnegie Institution of Washington. Publication no. 114.)) (Vollpigmentiert, russenfarbig, albino)
-//"Marchlewski (1934)//[((Marchlewski, T. (1934). Reverse mutations in color factors in the rabbit. J. Genet. 29, 153-157.))] //has observed what appear to be two cases of reverse mutation from one of the chinchilla genes (probably c<sup>ch2</sup>) to full color. The first, a castorrex, arose from purebred chinchilla rex parents. Crossed with chinchilla or albino females it gave a 1:1 ratio of full color agoutis and chinchillas, demonstrating its constitution to be Cc<sup>ch2</sup>. In another closely related line, the F<sub>2</sub> progeny from a cross of chinchilla rex by white (cc) angora contained two full yellows. Mating one of these with normal-haired pure chinchillas or to triple recessive chinchilla males also gave a 1:1 ratio of full colored and chinchillas. Because reverse mutations are usually rare, the fact that (as Marchlewski points out) both of these cases occurred from related animals, and in a population of less than 500, suggests that these observations may be of further significance. Since the C gene in the rabbit has mutated at least 5 times, this observation may indicate that, at least under certain circumstances, it is a relatively unstable locus."//((Sawin, P. B. (1955). Recent genetics of the domestic rabbit. Advances in Genetics, 7, 183-226.))
+//"Marchlewski (1934)//[((Marchlewski, T. (1934). Reverse mutations in color factors in the rabbit. J. Genet. 29, 153-157.))] //has observed what appear to be two cases of **reverse mutation** from one of the chinchilla genes (probably c<sup>ch2</sup>) to full color. The first, a castorrex, arose from purebred chinchilla rex parents. Crossed with chinchilla or albino females it gave a 1:1 ratio of full color agoutis and chinchillas, demonstrating its constitution to be Cc<sup>ch2</sup>. In another closely related line, the F<sub>2</sub> progeny from a cross of chinchilla rex by white (cc) angora contained two full yellows. Mating one of these with normal-haired pure chinchillas or to triple recessive chinchilla males also gave a 1:1 ratio of full colored and chinchillas. Because reverse mutations are usually rare, the fact that (as Marchlewski points out) both of these cases occurred from related animals, and in a population of less than 500, suggests that these observations may be of further significance. Since the C gene in the rabbit has mutated at least 5 times, this observation may indicate that, at least under certain circumstances, it is a relatively unstable locus."//((Sawin, P. B. (1955). Recent genetics of the domestic rabbit. Advances in Genetics, 7, 183-226.))(S. 185)
 ===== Dominanzverhalten und Pigment-Ausprägung =====