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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 2 of 2 (0.154 seconds)
1

Selektionsexperimente zur Erhöhung des Männchenanteils bei Nilbuntbarschen (Oreochromis niloticus) mittels Temperaturbehandlung / Selection experiments to increase the male proportion in Nile Tilapia (Oreochromis niloticus) by means of temperature treatment

Wessels, Stephan 14 July 2006 (has links)
No description available.
630 Landwirtschaft
Veterinärmedizin
Agricultural Sciences
Tilapia
Geschlechtsdetermination
Selektionsexperiment
Oreochromis niloticus
Nile Tilapia
sex determination
selection experiment
temperature sex determination
Oreochromis niloticus
48.60
48.64
48.68
YF
2

Reverze pohlaví u ještěra s genotypově určeným pohlavím (Squamata: Acrodonta: Pogona vitticeps) / Sex reversion in the lizard with genotypic sex determination (Squamata: Acrodonta: Pogona vitticeps)

Ehl, Jan January 2015 (has links)
Sex determination among reptiles is a very variable matter across it's taxa. We meet there temperature sex determination and genotypic sex determination with many independent transitions between them. It is a group suitable to study evolution of sex determination, sex chromosomes and sex determination genes. Rare cases of sex reversal caused by extreme incubation temperature or exogenous hormones have been reported in recent years. In case of Acrodont lizard, Pogona vitticeps, was reported sex reversal caused by high incubation temperatures. Our purpose was to repeat the experiment, mainly due to insufficient conclusiveness of used methods. We wanted to expand the experiment by hormonal reversal, studying persistence of sex reversal to maturity and fertility of reversed individuals. We managed successfully to demonstrate sex reversal in both treatments by histological examination. Individuals with discordant phenotypic and genotypic sex were breed till one year of life, which demonstrate persistence of reversal. Our outcomes are concordant with most recent work on this species and show full functional phenomenon of sex reversal with reptiles, which studying could contribute to our understanding of evolution of sex determination.

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