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Development of the secondary sex ratio in the world
Mielniczková, Aneta ; Pavlík, Zdeněk (advisor) ; Kalibová, Květa (referee)
Development of secondary sex ratio in the world Abstract A secondary sex ratio is one of the surveyed population sex ratios. The goal is to describe the development of this index in 1950-2008 period in the world. First, the world is analyzed at the level of "subregion", followed by the analysis of the continents and then a summary of the results. Calculations for the level of "subregion" are compared with estimates of the UN. Analysis of the continent is displayed through the use of frequency tables, which are displaying the development of the index in time along with data availability. The summary of this paper consists of theoretical assumptions that could affect the child's sex. That is why, these assumptions are often associated with epigenetic factors influencing the sex of some animals. In the analysis of the secondary sex ratio the importance of data reliability, which plays a key role, is highlighted. Unfortunately, for Africa there had to be used insufficient data, in places where the value significantly fluctuated. On the contrary, the advanced countries have provided quality data. Most of the expected assumptions were confirmed by the results. Keywords: secondary sex ratio, the sex ratio at birth, influences on the sex
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Development of the secondary sex ratio in the world
Mielniczková, Aneta ; Kalibová, Květa (referee) ; Pavlík, Zdeněk (advisor)
Development of secondary sex ratio in the world Abstract A secondary sex ratio is one of the surveyed population sex ratios. The goal is to describe the development of this index in 1950-2008 period in the world. First, the world is analyzed at the level of "subregion", followed by the analysis of the continents and then a summary of the results. Calculations for the level of "subregion" are compared with estimates of the UN. Analysis of the continent is displayed through the use of frequency tables, which are displaying the development of the index in time along with data availability. The summary of this paper consists of theoretical assumptions that could affect the child's sex. That is why, these assumptions are often associated with epigenetic factors influencing the sex of some animals. In the analysis of the secondary sex ratio the importance of data reliability, which plays a key role, is highlighted. Unfortunately, for Africa there had to be used insufficient data, in places where the value significantly fluctuated. On the contrary, the advanced countries have provided quality data. Most of the expected assumptions were confirmed by the results. Keywords: secondary sex ratio, the sex ratio at birth, influences on the sex
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