biological significance of mitosis is very high.Neposveschennomu hard to imagine the role played in the life of a simple process of dividing cells in the body.The ability of cells to share - is the most important function of, fundamental.Without this it is impossible continuation of life on Earth, increasing the populations of unicellular organisms can not develop, and the continued existence of large multicellular organisms, it is impossible as sexual reproduction and development of the new life of a fertilized egg.
biological significance of mitosis would be much less if the cell division was not the essence of the majority taking place on our planet biological processes.This process takes place in several stages.Each of them includes a number of action within the cell.The result of this multiplication is mandatory genetic basis of one cell into two by duplicating DNA, subsequently to the parent cell to two daughter gave birth.
entire life of the cell can be concluded in the period from the formation of a subsidiary to its subsequent division into two.This period is in biology called "cell cycle".
very first phase of mitosis - a proper preparation for cell division.The period in which the cell nuclei endowed perform direct preparation of division is called interphase.It happens all the most important - namely the doubling of the DNA strands and other structures, as well as the synthesis of large amounts of protein.Thus, the chromosomes are doubled cell, and each half of a double chromosome is called "chromatid".
interphase begins immediately after the process of division - mitosis.It also takes place in several stages.As a result, all parts are stretched symmetrically doubled the cage, so that after the formation of the central partition in each new cell is the same amount of the produced components.
Phase of mitosis and meiosis are similar, but in the latter (at division of sex cells) has two divisions, and in the end turns out not two, but four kletki "daughter."Also, prior to the second division there is no doubling of the chromosome, so they set in the daughter cells remains half.
1. Prophase.In this phase, the centrioles cells are very visible.They are present only in cells of animals and humans.Plants do not have centrioles.
2. prometaphase.At this point it ends prophase and metaphase begins.
3. Metaphase.At this point lie on a chromosome "equator" of the cell.
4. Anaphase.Chromosomes depart to different poles.
5. Telophase.One kletka- "mother" is divided by the formation of a central partition into two kletki "daughter."So ends the cell division, or mitosis.
most important biological importance of mitosis - is exactly the same division of the duplicated chromosomes into two equal parts and putting them in two kletki "daughter."Different types of cells and cells of various organisms have varying duration of time division - mitosis, but on average, it takes about one and a half hours.There are many factors that influence this very fragile process.Any changing environmental conditions, such as ambient temperature, light-phase mode, the pressure in the environment and inside the body and cells, as well as many other factors that can significantly influence the duration and quality of the process of cell division.Also, the duration of mitosis and all its individual stages can be directly dependent on the type of tissue, the cells of which he proceeds.
biological significance of mitosis with each new discovery in the field of cytology becomes more valuable, because without this process can not be life on the planet.
