No phantom manifestation of life, not in creative forms, and in the earth, body, even in the opinion of many, the manifestation of the life of the low-lying teenager experiencing his own existential. The cause of his tragedy could not for the fact that happiness is not feasible for all of humanity, as a pimple on the face, because of which supposedly can not go to the disco.
The teenager – a realist and a romantic at the same time, he experiences as the self-integrity, and the possibility of its loss. Good and evil, life and death in his experiences of concrete and abstract at the same time, since he is just learning to think abstractly, so in the process of thinking, searching for regularities it can easily take a random general, concrete – for the abstract, unity – for the overall . He experiences the mismatch force of their feelings, experiences, and capabilities of their thinking, the teenager – is the person who can formulate and try to solve the problem of development of their own thinking. It is for him to write all the books on self-reproduction nutrition, he can use it (if they wish) their wisdom not to manipulate others, and the impact on himself.
So existential experiences related to adolescent real manifestations of life, I have the fire in them the rhythm.
I think it is interesting to note the fact that creativity, allowing the teenager to experience the fullness of life, is associated with efforts to organize J. teenager starts to do something special to set the task to make it creative-cally, that is, in its own way. So there is already performing their activities (eg, self-mastery of musical instruments), of Fine work, literary and other. It is important that it is now perceived, ripped apart and carried for-me-important-activities. What a pity that so-Leko not all adolescents have the opportunity to try out different kinds of cultural initiative, allowing her to feel the power I.
Maybe then we would not be witnessing the manifestation of this power in the form of a bundle of twisted metal benches in the park, break down the door and pro-what such. Destructive “creativity” of adolescents deserves, I think, atten-tion is not less than their constructive initiative. In my opinion, we still do not know why there is this incredible force, worthy, of course, the best application. What forces pulled out from under the reasonable control of the I at the time? I think that the problem of waiting for their researchers.
On stage diplonema is shortening, thickening and mutual repulsion of sister chromatids, resulting in chromatids in a bivalent almost severed. The separation is incomplete for the reason that in each pair of chromosomes is not yet digested the centromere. As for the bivalent, they are held at various locations along their length with chiasmus, co-torye are structures formed between homologous chromo-Machida as a result of crossing-over between the previous synaptic Holy zannymi homologs. In good preparations can be observed from one to several chiasmus, depending on the length of the bivalent. Each observed at this stage chiasm is the result of the exchange, which met between nesestrinskimi chromatids during step pahinemy. Since the compression and repulsion bivalent amplified chiasm move to the ends of chromosomes, ie, there is terminaliza-tion of chromosomes. At the end of diplonema comes despiralization chromosomes homologs continue to repel each other.
At the stage of diakinesis, which is similar to diplotene continues shortened chenie-bivalents and comes attenuation (reduction) of chiasmus, thereby forming discrete units as chromatids (four). But directly after the completion of this stage, the dissolution of the nuclear membrane.
In metaphase I bivalents reach the greatest condensation. Becoming oval, they are located in the equatorial part of the nucleus, where the equatorial plate is formed meiotic metaphase I. The shape of each bivalent is determined by the number and localization of the chiasmus. In men, the number of chiasmus in the bivalent at metaphase I is usually 1-5. XY bivalent is a result of a single rod-terminally located chiasm.
In anaphase I begins to move opposite to the centromere of the opposite poles of the cell. This results in the separation of homologous chromosomes. Each chromosome consists of two chromatids are now held by the centromere, which is not divided and remains intact. This anaphase I of meiosis is different from anaphase of mitosis in which the centromere undergoes separation. It is important to note that due to crossing-over, each chromo-Machida is genetically different.
In telophase I chromosomes reach the poles than the end of the first meiotic division. After telophase I occurs a short interphase (interkinesis), in which the chromosomes Despi-ralizuyutsya and become diffuse-mi, or telophase I goes straight into the second meiotic prophase II fission. None, in either case the DNA replication can be identified. After the first meiotic cell division called spermat & tsitami II order. The number of chromosomes in each such cell is reduced from 2n to n, but the content of DNA is not modified.
The second meiotic division is carried out in several phases (prophase II, metaphase II, anaphase II, telophase II) and is similar to the mitotic fact-tion. In prophase II chromosomes secondary sperm matotsitov remain at the poles. In metaphase P centromere of each chromosome is divided into double, providing each new chromosome own centromere. In anaphase II begins the formation of the spindle pole to which the new chromosomes move. In those II-lofaze second meiotic division ends, whereby each order spermatocyte II gives two sperm yes, from which then differentiated sperm. As in the secondary spermatocyte, the number of chromosomes in a haploid spermatids (n). However, chromosomes are single spermatids, while the chromosome II of secondary spermatocytes are double, being constructed of two chromatids. Consequently, the core of each spermatid has a single set of non-homologous chromosomes. Tion secondary meiotic division is the division of the mitotic type (equatorial division). It shares the double sister chromatids and differs from reduction division in which homologous chromosomes are separated. The only significant difference from the classical mitosis is that there is a set of haploid chromosomes.