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Mitosis is a cell division process that results in two daughter cells. Each of those cells has the same number and kind of chromosomes as the parent nucleus. In other words, Mitosis is defined as a part of the cell cycle when replicated chromosomes are separated into two nuclei.
On the other hand, meiosis involves the process of two successive cell divisions and results in four daughter cells. Biologically, it is referred to as a special type of cell division that reduces the number of chromosomes by half. The process occurs in a sexually reproducing single-celled and multi cellular eukaryotes.
The concept of Meiosis is primarily based on the process where a single cell divides twice in order to produce four cells. It contains half the original amount of genetic information. These cells are also known as the sex cells; eggs in females and sperms in males. Meiosis can be divided into 9 stages. Here’s everything you should know about. Take a look.
Figure 1: The Stages of Meiosis
3. Prophase I:
4. Metaphase I:
5. Anaphase I:
6. Telophase I and Cytokinesis:
7. Prophase II:
8. Metaphase II:
9. Anaphase II:
10. Telophase II and Cytokinesis:
Now that you are aware of the meiosis definition and the different stages involved in the process, let’s talk about the fundamentals of Mitosis.
Mitosis is the cell division where the mother cell divides in order to produce two new daughter cells. These are genetically identical to one another. In this particular part of the cell division process, the DNA of the cell’s nucleus is divided into two equal sets of chromosomes. The majority of cell division that happens in our body involves the process of Mitosis.
It populates the organism’s body with cells. This particular process involves the replacement of old, worn-out cells with the new ones.
Mitosis consists of four basic stages; namely Prophase, Metaphase, Anaphase and Telophase. Let’s delve deep into the fundamental aspects of each of the stages.
Figure 2: The 4 Stages of Mitosis
Early Prophase: At the stage of early prophasethe cell tends to break down some structures and build up others. This, as a result, sets the stage for division of the chromosomes. The chromosomes start to condense and the mitotic spindle begins to form. Eventually, a part of the nucleus where ribosomes are created disappears. This is an indication that the nucleus is all set to break down.
Late Prophase: Also known as the Prometaphase, the mitotic spindle starts capturing and organising the chromosomes during the stage of Late Prophase. The chromosomes are very compact as they finish condensing, and the nuclear envelope breaks down, releasing the chromosomes. Eventually, the mitotic spindle grows more with some of the microtubules beginning to capture the chromosomes.
This is one crucial phase where the spindle captures all the chromosomes and lines them up at the middle of the cell. At this stage, all the chromosomes align at the metaphase plate. The two kinetochores of each chromosome are attached to the microtubules.
Before advancing to the next stage of Anaphase, the cell will check and make sure that all the chromosomes are at the Metaphase plate with the kinetochores appropriately attached to the microtubules.
At this particular stage, the sister chromatids separate from each other. They are eventually pulled towards the opposite ends of the cell. Here’s how the process works. Take note.
It is to be noted that each of these processes is driven by motor proteins along the microtubule tracks. The motor proteins in Mitosis carry other microtubules and chromosomes as they walk.
As the cell in Telophase is almost done dividing, it begins to re-establish its normal structures as Cytokinesis occurs. Here’s how the entire process works.
Apart from knowing about the entire functionality of the different stages associated with the process of Mitosis, we shall also learn the difference between Mitosis and Meiosis.
There are ideally two cells created after the process of Mitosis with the same 46 chromosomes. However, the Haploid cells are generated through Meiosis, for example, egg and sperm having only 23 chromosomes.
When it comes to exploring the various fundamental aspects associated with the study of Mitosis vs. Meiosis, establishing well-defined points of difference between the two becomes crucial. Here’s everything one must consider.
|The type of reproduction involved in Mitosis is asexual in nature.||The type of reproduction involved in Meiosis is sexual in nature.|
|Mitosis is genetically similar.||Meiosis is genetically different.|
|There’s no scope for crossing over to occur in Mitosis.||Meiosis involves the process of mixing of chromosomes.|
|There is only one division.||Meiosis involves two divisions.|
|There is no pairing of homologs involved.||Meiosis involves the pairing of homologs.|
|The mother cells can either be haploid or diploid.||The mother cells are always diploid.|
|Two diploid cells are produced during the process of Mitosis.||Four haploid cells are produced during the process of Meiosis.|
|The number of chromosomes in Mitosis remains the same.||The number of chromosomes in Meiosis is reduced to half.|
|Chromosomes pairing do not occur in Mitosis.||Chromosomes pairing in Meiosis takes place during zygotene of the Prophase I up to Metaphase I.|
|Creates everything apart from sex cells.||Creates female egg cells and male sex cells.|
|Mitosis takes place in somatic cells.||Meiosis takes place in germ cells.|
|The spindle fibre in Mitosis disappears completely in telophase.||The spindle fibre in Meiosis does not disappear fully in Telophase I.|
|Karyokinesis occurs in Telophase.||Karyokinesis occurs in Interphase I|
|The duration of prophase is short in Mitosis. It is usually of a few hours.||The duration of Prophase in Meiosis is relatively longer. It can take days to complete.|
|The centomeres divide during the stage of Anaphase.||The Centomeres split during the stage of Anaphase I.|
Table 1: Difference between Mitosis and Meiosis
Now that you know how is Meiosis different from Mitosis, take some time to recapitulate each of the points mentioned above for a firmer establishment of the entire concept. I hope the blog will add great values to your knowledge of Mitosis vs. Meiosis.
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