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Eukaryotic cell cycle

As expressed in the cell theory: all the cells are formed from preexisting cells. The growth and development of living organisms depends on the growth and multiplication of their cells when a cell divides, the genetic information contained in DNA is precisely duplicated copies are then transmitted to each c 鬵 daughter. In prokaryotes this process 󮠥 s simple division called binary fission. In eukaryotes the DNA is organized into more than one chromosome, with the process of cell division 󮍊 more complex.
Despite differences between prokaryotes and eukaryotes, there are many points in common between both cell division cell, which must pass through four stages: Growth

duplication must occur DNA. DNA must be separated
"original" of his "reply" (for it is packaged into discrete units or chromosomes)
cells must separate the two "daughters" which ends with cell division.
These basic processes should occur in both types of cells.

Cell cycle: the cyclical sequence of processes in the life of a eukaryotic cell that retains the ability to divide. Consists of interface, mitosis and cytokinesis. The time required to complete a cell cycle is the time regeneration.

In general, all cells go through two períoos in the course of their cell cycle: INTERFACE
one: is the period during which the cell grows, replicates its DNA and prepares for the next division;
period of division Phase M: is the stage of the cell, leading in turn to two events:

MITOSIS or division of n: separate replicated daughter chromosomes before and ...

cytokinesis or division of the cytoplasm into two daughter cells.

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THE CELL CYCLE CELL DIVISION CELL DIVISION

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Cell Division to cell division occurs growth multicellular organisms with the growth of tissues and vegetative reproduction in unicellular organisms. Note that a stem cell two daughter cells arise, not three.
types of cell division
Binary fission is the form of cell division in prokaryotes cells.
' Mitosis most common form of cell division in eukaryotic cells . A cell that has acquired certain parameters or terms of size, volume, energy storage, environmental factors can fully replicate their DNA and divide funding into two daughter cells, usually the same. Both cells are diploid or haploid , depending on the mother cell.
Meiosis is the division of a diploid cell into four haploid cells. This cell division occurs in multicellular organisms to produce haploid gametes, which can be merged later to form a diploid cell called a zygote in fertilization.
multicellular beings replace their cell envelope by cell division and is usually associated with differentiation cell. In some animals, cell division stops at some point and just aging cells. Senescent cells deteriorate and die due to aging the body. The cells stop dividing because the telomeres become increasingly shorter at each division and can not protect chromosomes . cancer cells are immortal. A enzyme called telomerase allows these cells to divide indefinitely.
The main feature of cell division in eukaryotes is the conservation of the genetic cycle control cellular and cell division, since it has remained virtually unchanged from simple organisms such as yeasts such complex creatures like humans, over biological evolution.
causes of cell division
A theory explains that there is a time when the cell begins to grow much, decreasing the area / volume. When the area of \u200b\u200bthe plasma membrane is much smaller in relation to the total volume of the cell, there are difficulties in absorption and transport of nutrients, making it necessary for cell division occurs. Retrieved
of " http://es.wikipedia.org/wiki/Divisià n_celular ³" Category

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CELL DIVISION

All cells of any plant or animal have come from a single initial cell by a division process. Many living cells are capable of dividing to produce new cells for growth and repair, however, there is a second type of cell division that is specially created to give rise to gametes (sex cells) required for reproduction cell (and also one of the two types of spores).

Cell division can be so that is kept in the daughter cells the number of chromosomes in the mother cell (diploid envelope). However, it can also be reductional, that is, when the two daughter cells are endowed of a burden halved chromosome (haploid), about the stem cell.


1. CELL NUCLEUS

is characteristically surrounded by a membrane, is spherical and measures about 5-8 mm in diameter. Within the nucleus, the DNA molecules and proteins are organized into chromosomes that often appear arranged in identical pairs. The chromosomes are very twisted and tangled and difficult to identify separately. But just before the cell divides, condense and acquire thick enough to be detectable as separate structures. The DNA within each chromosome is a single very long molecule, which is convoluted, and contains linear sequences of genes. These in turn contain coded instructions for building the proteins and RNA molecules needed to produce a functional copy of the cell.

The core is surrounded by a double membrane composed of two lipid bilayers, and the interaction with the rest of the cell (ie cytoplasm) occurs through holes called nuclear pores. The nucleolus is a special region in which ribosomal RNA synthesis (rRNA) needed to form the two immature members of the ribosome subunits, which migrate to the cytoplasm through nuclear pores, which join to form functional ribosomes.

The nucleus controls protein synthesis in the cytoplasm sending molecular messengers. It produces the synthesis of long chains of heterogeneous nuclear RNA from the instructions contained in DNA (transcription). These strings are modified (transformation) to become shorter fragments of messenger RNA (mRNA) that only a small percentage go to the cytoplasm through pores nuclear. Once in the cytoplasm, the mRNA attaches to ribosomes and encodes the primary structure of protein (translation).


2. REPRODUCTION PROCESS

Every living organism needs to play its cell body or its cells, either for growth, to replace the structure or the mere reproduction.

The first type of division has known the name of Mitosis and developed in all cells in the direct lineage of the original line still in its growth. The second type of division, called meiosis, takes place only in germ cells, where they produce gametes (sperm and eggs), then carrying a haploid set of chromosomes. When male and female gametes merge, at the time of fertilization, will produce again a cell with diploid chromosome number typical of the species to which they belong; of this cell derived then the entire body. 2.1 Playback



Mitosis is the process of cell division by which a new cell takes on a number of chromosomes identical to its parent. This cell division involves the equal sharing of cellular material between the two daughter cells. Thus, mitosis is a mechanism that allows cells to distribute in the same duplicate material quantities during interphase.

Mitosis consists of 4 phases: prophase, metaphase, anaphase and telophase. The cell in the resting stage (interphase), has a core in which the chromatic substance is lightly colored and is in an almost diffuse. At the beginning in prophase, the centrioles split and the centrosomes are directed toward the cell poles to form the so-called spindle. In metaphase, the cell membrane disappears and the chromosomes are attached at equal distance from both poles in a plane perpendicular to the spindle. In anaphase, the chromosomes are split longitudinally into two daughter chromosomes into two equal groups that are directed towards the spindle poles achromatic. Finally, in telophase, the character appears reticular nucleus, spindle fibers cease to exist, the nuclear membrane and cell division is complete. 2.2 Playback



Meiosis is the process of cell division by which a cell divides to give rise to sex cells (gametes). There is a twofold division of germ cells to reduce by half the number of chromosomes and, therefore, causes haploid cells. Meiosis is an appropriate mechanism for the distribution of genes among gametes, so that allows random recombination and segregation. It is possible to distinguish two separate divisions: the first division Y la segunda división Meiotic Meiotic. Each of these una divisione pueden en su time dividirse different phases.

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