This is cell division that leads to formation of something small. During the process, diploid eukaryotic cell begins to divide into quadrants that are of equal sizes referred to as haploid cells. Often they are known as gametes and the amount of chromosomes that are found in gametes formed from diploids decrease when compared to parent diploid cells.
Mitosis is a reproduction technique for single cell organisms reproducing asexually. In this case, identical versions of organisms are created through cell splitting into two.
Meiosis can result to millions of egg cells and spermatozoa with genetic patterns that are unique. Mating of 2 cells in meiosis results to creation of unique genetic offspring that is of a similar species and it is a major contributor in natural selection, evolution as well as biodiversity.
Cellular division processes in meiosis and mitosis are present in all life forms and this includes fungi, humans, plants, single celled species and organisms as well as animals. This essay was written by a professional writer at essayhomeworkhelp.
If however you are interested in buying a paper of similar quality, place your order with us. We have at our disposal, expert writers backed by years of academic writing willing to deliver a paper that is of premium quality to you. Difference between Mitosis and Meiosis. In addition, each chromosome becomes doubled and the bivalent turns to a 'tetravalent' with two paternal sister chromatids and two maternal sister chromatids.
Also in this stage, exchange of genetic material occurs. This is made possible by the formation of a few breaks at identical site in the chromatids. The broken segments then reunite with or without exchanges of chromatid segments. The process of exchanges of segments between non-sister chromatids is of great genetic consequence since it results in reshuffling of parental genes which are present in the chromatids.
This process is also called 'crossing over'. With the condensation process still continuing, the tetravalent appear thicker. Now, the pairing homologous units undergo a process of repulsion and start moving apart. However, two non-sister chromatids are held united at the points of exchanges.
Such points are called chiasmata. It gives a characteristic chromosomal configuration as given in the diagram. This stage is the last of pairing process and the end of prophase I. Here the chromosomes appear very thick and they move away from each other and spread towards periphery.
The chiasmata found at the points of crossing over between chromatids undergo a process called terminalization whereby some departing chromosomes are found held up only terminally as shown in the diagram. This stage is also marked by the breakdown of the nucleolus and nuclear membrane and organization of spindle at the poles. Here the bivalent chromosomes align at the equatorial plate vegion of the spindle. In contrast to mitosis, the centromeres of sister chromatids are adjacent to each other and oriented in the same direction, while the centromeres of homologous chromosomes are pointed towards opposite spindle poles.
So, the microtubules from the same pole the spindle attach to sister chromatids, while microtubules from opposite poles attach to homologous chromosomes. This phase is initiated after complete disruption of the chiasmata at which homolog chromosomes are joined.
The homologous chromosomes then separate while sister chromatids remain joined at the centromeres. This marks the completion of meiosis and formation of two daughter cells that ha acquired one number of each homologous pair consisting of two sister chromatids.
Meiosis-II initiates immediately after cytokinesis in some cases no cytokinesis occur at this stage , before chromosomes have fully descended. Like meiosis this procedure is also a multistage procedure. The two phases of meiosis is called meiosis 1 and meiosis 2 and both stages have four sub-stages of their own. Meiosis 1 has phases consisting of prophase 1, metaphase 1, anaphase 1 and telophase 1. Likewise meiosis 2 has prophase 2, metaphase 2, anaphase 2 and telophase 2.
In meiosis 1, a germ cells splits into two diploid cells and there is an exchange of genetic material, however the processes of meiosis 2 is similar to the process witnessed in mitosis. It is hoped that a further understand of these processes can lead to better medical procedures and technology. Writing better Persuasive essays Essay tips Creating an essay introduction Writing an excellent college essay Tips for writing a paper outline Composing an argumentative essay Academic essay outline Writing a two-paragraph essay Essay writing prompts Composing a descriptive essay Sample about the Hotel Texas Easy essay topics for high school Same-sex marriage: Writing a persuasive essay Opinion essay for college Writing a great essay outline Essay writing help Looking for an essay example Excellent argumentative topics The impact of media: Mitosis And Meiosis Mitosis and Meiosis describes the way in which cells divide and reproduce.
Meiosis. Meiosis is very similar to mitosis, however, major distinction is that meiosis consists of two groups of divisions, meiosis I and meiosis II (both consisting of 4 sub-stages) and occurs only in sexually reproducing organisms.
Meiosis Vs. Mitosis Essay - More than one celled organisms grow by way of mitosis and the cytoplasmic division of body cells. On the other hand, meiosis occurs only in germ cells, which are put aside for the formation of gametes (sperm and egg). Reproduction by meiosis allows for species survival and it increases genetic variability.
Now, In Meiosis there is only one more phase for each stage of Meiosis, then Mitosis. Let’s see where I’m heading first in my Magical Meiosis journey. Let Maryann tell you about the back round of Meiosis. What is the Difference Between Mitosis and Meiosis? The cell is the basic units of life and for life to flourish, these cells reproduce copies of themselves through a cycle of growth and division. The entire cycle is known as the Cell Cycle. The cycle is divided into phases. The G1, S, G2, and M phases.
Jan 10, · Meiosis is the process by which eukaryotes sexually reproduce. Using humans as the examples, new humans are created by meiosis, but within the human, mitosis reproduces cells. Mitosis results in two identical cells, that is the two cells are clones of each other. Compare and Contrast Mitosis and Meiosis – Essay Sample Home / Essay Examples / Biology / Compare and Contrast Mitosis a Comparison of mitosis and meiosis is a common task for almost all biology classes.