Question

Сколько хромосом содержит вегетативная клетка пыльцевого зерна, зародыш семени и центральная клетка зародышевого мешка земляники, если клетки столбчатой ткани листа содержат 14 хромосом ? Из каких клеток и в результате какого деления образуются эти клетки ? ответ пожалуйста поясните и распишите

Answer 1

Number of Chromosomes in Different Cells

The number of chromosomes in different cells can vary depending on the organism and the specific cell type. In the case of strawberry (Fragaria), the vegetative cell of a pollen grain, the embryo sac, and the central cell of the embryo sac all have a certain number of chromosomes.

Unfortunately, I couldn't find specific information about the number of chromosomes in the mentioned cells of a strawberry plant in the search results provided. However, I can provide you with some general information about the topic.

In most plants, including strawberries, the vegetative cells of pollen grains are haploid, meaning they contain half the number of chromosomes compared to the somatic cells of the plant. The somatic cells of a strawberry plant typically have a diploid number of chromosomes.

The embryo sac, which is the female gametophyte in flowering plants, is also haploid. It is formed through the process of megasporogenesis, which involves meiotic division of a diploid megaspore mother cell. This results in the formation of four haploid megaspores, out of which only one survives and develops into the embryo sac.

The central cell of the embryo sac, which is involved in double fertilization in flowering plants, is also typically haploid.

Formation of Cells and Divisions

The cells you mentioned, such as the vegetative cells of pollen grains and the cells of the embryo sac, are formed through specific processes of cell division.

The vegetative cells of pollen grains are formed through the process of microsporogenesis. This involves the division of diploid microspore mother cells in the anthers of the flower. The microspore mother cells undergo meiosis to produce four haploid microspores. Each microspore then develops into a pollen grain, which consists of two cells: the vegetative cell and the generative cell.

The embryo sac, on the other hand, is formed through the process of megasporogenesis. This involves the division of diploid megaspore mother cells in the ovule of the flower. The megaspore mother cells undergo meiosis to produce four haploid megaspores. Only one of these megaspores survives and develops into the embryo sac, which contains several cells, including the central cell.

It's important to note that the specific details of cell division and chromosome numbers can vary among different plant species. If you need more specific information about the number of chromosomes in the mentioned cells of a strawberry plant, I would recommend consulting a reliable botanical resource or textbook.

I hope this information helps! Let me know if you have any further questions.