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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Comparison of the rate of evolution in genes located on reptile sex chromosomes and autosomes
 Kuldanová, Kateřina ; Johnson Pokorná, Martina (advisor) ; Reifová, Radka (referee)
According to the "faster-X effect", X-linked genes and Z-linked genes evolve more quickly than autosomal genes. This theory is one of the currently intensively studied topics in evolutionary research. However, performing high quality tests is difficult because the results are influenced by several factors - the effective size of the population of the gonosome, sexual selection, the dependency of mutation rate and selection on sex, and the mechanism of dosage compensation. Conservation of genes and possible differences between rates of evolution of autosomes also play a role and not all studies take this fact into account. This study shows some of the difficulties of paired comparisons of dN/dS ratios traditionally used to test faster-X or faster-Z effects and introduces the basis of a new method of comparison of the rate of evolution (CREC) based on relative genetic distances between three species. The CREC method reduces the influence of conservation of genes on results and is more applicable for testing faster-X or faster Z effects in such species where two species without homologic gonosomes can be found for comparison. In means of the development of this method, the faster-Z effect was tested on a dataset of 9 autosomal and 13 Z-linked genes in the six-striped long-tailed lizard (Takydromus...
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Morphometric analysis of sex differences in four species of lizards
 NERAD, Pavel
Morphometric analysis identified differences in body size of selected species of reptiles. For comparison ANOVA and ANCOVA tests were used. For Pachydactylus bibroni males are larger sex in these factors: length and width of the head absolutely, the absolute difference in the length and width of the body, tail length and tail width. For Cosymbotus platyurus is also the absolute difference in the size of all body parts in favor of males. This difference is the same as Pachydactylus bibroni. In Riopa fernandi males are larger in the length and width, head length and width of the body and tail width. The female is larger in the length of the tail. In Takydromus sexlineatus no difference between the sexes in the length and width of the head and tail length were found, but the absolute difference in the length and width of the body in favor of females. The male has a larger base of the tail than females.
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