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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Processes determining the stability of cytotype coexistence in plant populations
 Nedomová, Anežka ; Čertner, Martin (advisor) ; Urfus, Tomáš (referee)
Multiplication of nuclear genome is considered one of the most important processes in the plant evolution. Neopolyploids arise in a diploid population by merging of two unreduced gametes or through "triploid bridge". However establishment of a new polyploid in the current population is not easy. Polyploid has to overcome through various mechanisms (like a self-pollination, nonrandom pollination, etc.) "the minority cytotype exclusion" and increase their frequency in the population. Diploids and polyploids differ in ecological demands and competition abilities. There is no correlation between ploidy and wide ecological amplitude or competition abilities. With the current knowledge, we can not determine in which case is the mixed population stable. There is an assumption that the population contains two closely related species simply can not be stable, and therefore all cytotype mixed populations are unstable. Powered by TCPDF (www.tcpdf.org)
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Marriage from the perspective of economics and sociology with regard to mate selection
 Konrádová, Kateřina ; Šanderová, Jadwiga (advisor) ; Vohlídalová, Marta (referee)
This bachelor thesis focuses on the issue of marriage, or more specifically, on the process of its formation or, in other words, mate selection. The author compares economic (G. S. Becker) and sociological (V. K. Oppenheimer) theory of the marriage market, including assortative mating. The subject of the work is to compare economic and sociological view of the issue of mate selection in an aim to discover common and different elements in the two scientific disciplines as regards the matter. The author works with four comparison criteria. The first one gives a general overview of the marriage market and describes how it functions, the second one shows the relationship between the marriage and job markets, the third is about assortative mating and the fourth one describes and explains changes in marriage behaviour in the second half of the twentieth century. Based on this, the author deems the sociological approach to be more adequate and suitable for investigating such a complex process as mate selection.
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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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