What are the six stages of mitosis?

Answer 1

h t t p ://library.thinkquest.org/C0118084/Gene/Chromosomal_Inheritance/StagesMitosis.htm ( Expired as of 2013)

Interphase

Prophase

Metaphase

Anaphase

Telaphase

Cytokinisis

Answer 2

According to Wikipedia, there are eight phases of cell cycle and mitosis.

1. Interphase
2. Preprophase
3. Prophase
4. Prometaphase
5. Metaphase
6. Anaphase
7. Telophase
8. Cytokinesis

For the source and more detailed information concerning your request, click on the related links section (Wikipedia) indicated directly below this answer section.

Answer 3

Firstly, "cell division of a somatic chromosome," does not exist. "Somatic chromosomes," correspondingly do not as well; you had a misconception. There are however somatic cells (not chromosomes), which are cells that perform bodily functions other than reproduction. In humans, somatic cells are diploid, meaning they have 2 sets of chromosomes (and thus 46 total chromosomes per nucleus), rather than the haploid gametes, which have 1 set of chromosomes (therefore a total of 23). Mitosis occurs in somatic cells whilst meiosisoccurs in sex cells. Mitosis is the duplication of a genetically identical nucleus. Do not confuse mitosis with the afterwards-occurring cytokinesis, which is the process of dividing the cytoplasm to form (again, following mitosis) two daughter cells. Mitosis involves the chromosomes whilst cytokinesis does not. Nonetheless, you were correct about one thing; mitosis is divided into 6 phases: interphase, prophase, prometaphase, metaphase, anaphase and telophase. During interphase, DNA (deoxyribose nucleic acid) in the nucleus is copied in the form of chromatin, an unwound and not dense form of DNA, allowing easy access but difficult transportation. The process of this DNA replication will not be discussed here. In prophase, the copied and original chromatin is continually wound and compact to form a highly dense/compact form of DNA, called chromosomes, which permit easy transportation but difficult access. However, later in mitosis, chromosomes are called sister chromatid. Also, in prophase, an early mitotic spindle begins to form. The mitotic spindle acts as a framework for splitting and moving chromosomes later in mitosis. The mitotic spindle is made of a pair of centrioles, a network of microtubules and a network of kinetochores. Centrioles are a center of radiating fibers and act as an anchor during mitosis. The microtubules are attached to the centrioles, as are the kinetochores. (Please, note, the following happens later in mitosis.) Thus, as the microtubules grow and lengthen, the centrioles are pushed to the opposite regions of the cell. Microtubules are also called polar fibers. Kinetochores pull in opposite directions. As a result, the extending microtubules, causing an increase of centriole distance, and pulling of kinetochores creates a sufficient and adequate force as to pull the correspondingly attached chromosomes apart into two identically same, but individual, chromatids. Now, we return to the stages before these events, resuming at the stage after prophase, called prometaphase. In prometaphase, the nuclear envelope disintegrates, releasing the now fully-condensed chromosomes onto a further developing mitotic spindle which initiated in prophase. The kinetochores attach to the center of the chromosomes through chemical bonding with the chromosome centromere. The kinetochores continue to pull the chromosomes in opposite directions as the microtubules continue to grow and lengthen, pushing the centrioles farther apart and therefore, aligning the chromosomes on an imagined mitotic plate or plane; this is called metaphase. When the chromosomes are aligned and prepared properly for separation, a chemical signal is released to continue. If the chromosomes are not arranged correctly, a signal is not released as to prevent nondisjuction. In anaphase, the continued pulling of the kinetochores and lengthening of microtubules splits (as described before) the chromosomes (remember, composed of two sister chromatid) into subsequently individual chromatids; there are now therefore two genetically same but individualchromatid (yet now identified as chromosomes), unlike before in which the two (one the original DNA chromosome and the other the corresponding copy) were connected by the centromere. The mitotic spindle as well begins to break as the centrioles, now at opposite ends of the cell, move the separated chromosomes to the corresponding and opposite region of by use of the remaining microtubules and kinetochores. In telophase, the chromosomes unwind back into chromatin where the two new and genetically same DNA begin to form 2 correspondingly genetically similar nuclei. This ends mitosis. Cytokinesis, not part of mitosis, then occurs (yet sometimes, cytokinesis does not occur immediately afterwards.) Cytokinesis splits the cytoplasm of the cell. A ring of microfilaments contract, almost pinching the cytoplasm into separation, making two genetically identical cells, called daughter cells.

- Immense credit is provided to Mr. McGee, a most superior teacher, one whose unfathomable reverence is justly deserved. Also, please note: the above is a, hopefully, succinct overview, lacking DNA replication details which have been excluded for brevity. Also, I hope grammatical and spelling flaws are minimal. If the latter is excessive, I apologize.

Answer 4

Interphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinasis