5339
1993
eng
article
1
2011-12-07
--
--
Primitive sex chromosomes in poeciliid fishes harbor simple repetitive DNA sequences
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.
urn:nbn:de:bvb:20-opus-61659
6165
In: Journal of Experimental Zoology (1993) , 265, 301-308
Deutsches Urheberrecht
Indrajit Nanda
Manfred Schartl
Jörg T. Epplen
Wolfgang Feichtinger
Michael Schmid
deu
swd
Physiologische Chemie
Chemie und zugeordnete Wissenschaften
open_access
Theodor-Boveri-Institut für Biowissenschaften
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/5339/Schartl13.pdf
5338
1993
eng
article
1
2011-12-07
--
--
Reproductive failure of dominant males in the poeciliid fish Limia perugiae determined by DNA fingerprinting
Hierarchical structures among male indlviduals in a population are frequently reflected ln differences in aggressive and reproductive behavior and access to the females. In general, sodal dominance requires the Investments, which in turn then may have to be compensated for by high reproductive success. However, this hypothesls has so far only been sufficiently tested in small mating groups (one or two males with one or two females) due to the difficulties of determining paternity by conventional methods. DNA fingerprinting overcomes these problems by offering the possibility to determine genetic relationships and mating patterns within larger groups [Borke, T. (1989) Trends Ecol. Evol. 4, 139-144]. We show here that in the poecUiid fish Limia perugitu, in small matlng groups the dominant male has 8 mating success of 100%, whereas ln larger groups lts contribution to the offspring unexpectedly drops to zero.
urn:nbn:de:bvb:20-opus-61643
6164
Proceedings of the National Academy of Sciences of the United States of America (1993) , 90, 7064-7068
Deutsches Urheberrecht
Manfred Schartl
Claudia Erbelding-Denk
Sabine Holter
Indrajit Nanda
Michael Schmid
Johannes H. Schroder
Jörg T. Epplen
deu
swd
Physiologische Chemie
eng
uncontrolled
reproductive success
eng
uncontrolled
sexual selection
eng
uncontrolled
size polymorpbism
eng
uncontrolled
sodal domlnance
eng
uncontrolled
simple repetitive sequences
Chemie und zugeordnete Wissenschaften
open_access
Theodor-Boveri-Institut für Biowissenschaften
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/5338/Schartl12.pdf