TY  - JOUR
A1  - Nanda, Indrajit
A1  - Schartl, Manfred
A1  - Epplen, Jörg T.
A1  - Feichtinger, Wolfgang
A1  - Schmid, Michael
T1  - Primitive sex chromosomes in poeciliid fishes harbor simple repetitive DNA sequences
N2  - The demonstration ofthe chromosomal mode ofsex determinationvia genetic experiments as well as the absence of heteromorphic sex chromosomes affirm poeciliid fishes as a unique group among vertebrates that are endowed with the mostprimitive form of sex chromosornes. In many different taxa the evolutionary process involved in the differentiation ofadvanced sex chromosomes is outlined through sex specifically organized repetitive sequences. In this investigation hydridization of synthetic probes specific to genomic simple repeat motifs uncovers a sex-specific hybridization pattern in certain viviparaus fishes ofthe family Poeciliidae. The hybridization pattern together with specific staining ofthe constitutive heterochromatin by C-banding reveals heterogamety in males (Poecilia reticulata) as weil as in females (P. sphenops). In P. velifera, however, C-banding alone fails to unravel the heterogametic status. The female specific W-chromosome can be detected by simple repetitive sequence probes. Therefore, the principal significance of heterochromatization as a means of generating differentiated sex chromosomes is evident.
KW  - Physiologische Chemie
Y1  - 1993
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/5339
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-61659
ER  -