Gametogenesis and Fertilization in Humans

This bachelor thesis summarises the topic of gametogenesis and fertilization in humans. A search in available literature was performed. The thesis concisely describes the cell cycle and cell division. The main focus is on meiosis, a reductional division that takes the lead part in sexual reproduction. The process of this division is described in detail, and also the mechanism that creates variability of protected cells is described. The product of meiosis is gametes, also known as germ cells. Production of these cells is a key moment in sexual reproduction. This thesis approaches this topic in the context of evolutionary biology and explains its importance in the survival of species on Earth. The main topic of the thesis is the production and maturing of human germ cells. This process is called gametogenesis. This thesis provides a cohesive description of the reproduction system of both sexes and describes the gradual maturing of the germ cells in gonads. The structure of both gametes, egg, and sperm is described with emphasis on the parts of these cells that take part in the process of fertilization. Female reproductive cycles are depicted, and their connection is explained. In contrast to this periodicity, the male continual maturing is also explained. This thesis compares the main differences in..

Organic food market in the Czech Republic

The contribution provides partial results of the research focused on organic food, a product from organic farming. The total area of ecologically farmed areas in the Czech Republic permanently increases, however the offer of organic food is insufficient, in particular in view of their structure. Deficiency in organic food is being solved by imports. Distributors play an important role in the organic food market. In the Czech Republic the largest share from them is occupied by retail chains. Their share continues to grow to the detriment of other sales channels. One of the main factors affecting consumers’ interest in organic food is its price. The comparison of organic food prices and prices of conventional food in the selected retail chains, Globus Czech Republic, limited partnership, SPAR Czech business company Pte., Tesco Stores CZ JSC, AHOLD Czech Republic JSC, BILLA Pte., and in organic food and healthy nutrition stores showed significantly higher prices. The smallest difference in prices can be monitored in the milk and milk products. On the contrary, the largest difference is in fruits, vegetables, eggs and jams. However, the consumers’ awareness of organic food quality is at the same time increasing and the consumers are willing to pay for them a higher price