Mitosis Research Paper

Chromosome pairs line up across the equator of the spindle at metaphase I (5). In anaphase I the chromosomes separate and travel to opposite ends of the spindle. The chromosomes migrate to the equators of two new spindles for metaphase 2 (7). Next the chromatids are pulled apart in anaphase 2 to form four clusters of chromosomes in telophase 2. The nuclear envelopes reform around four haploid nuclei that will give rise gamete

According to the data table, prophase is the longest stage of mitosis. Even though there were more tallies in the interphase section, interphase is not considered a stage of the mitotic cycle; it is more or less considered a stage in the cell cycle. Telophase is the shortest stage because there were very few cells that showed evidence of them actually being in this stage. Metaphase and anaphase are intermediate stages, with metaphase being longer than anaphase.

2. In which phases of mitosis are sister chromatids visible, and attached to each other at the centromere?

Although mitosis is just a fraction of time compared to interphase it can be divided into four distinct subphases. If we start viewing a cell under a brightfield microscope right at the end of interphase subphase G2 we would see that throughout the interphase process (fig 1) the cell has grown considerably in size due to production of extra mitochondria and endoplasmic reticulum. The cell has also gone through the labor of duplicating all of its chromosomes, a process known as DNA synthesis. Now that the cell has made all of these preparations it's time to start prophase (fig 2), the first stage of the mitotic phase. This stage is visibly identified by the chromatin becoming the tightly formed chromosomes. During the lab we were able to view these newly formed chromosomes best on the onion root tip

Anaphase – the chromosomes are divided into single from pair and the chromosomes move to opposite poles

19) The phase of mitosis during which the nuclear envelope fragments and the nucleoli disappear is called

Mitosis is one of two main methods of cell replication, the other being meiosis. It is “the simple duplication of a cell and all of its parts” resulting from the splitting of a cell. The ‘parent’ or original cell splits, duplicating its DNA (packaged in chromosomes) producing two ‘daughter’ or new cells with the same genetic code. There are four stages of mitosis; Prophase, Metaphase, Anaphase and Telophase. Interphase is not an official phase of mitosis as the cell is at ‘rest’ and not being divided during this phase. It is often called one of the phases of mitosis as it is one of the stages in the life cycle of a cell; however it is not a phase of mitosis due to the fact that no division takes place.

We also learned about mitosis is divided into five phases prophase, prometaphase, metaphase, anaphase and telophase. There are many diffrence between the two articles.

In our mitosis microscope lab, the phase that was most identified was prophase, with a total of 49 times for mine. During prophase, there is a lot that must be accomplished before the actual division of chromosomes including but is not limited to: the breakdown of the nuclear membrane, condensation of chromosomes, and the synthesis of spindles. Prophase can take up as much as 50-60% of the total time required to complete mitosis; it spends around 20 minutes in the cell. In prophase, the chromatin condenses into double rod-shaped structures referred to as chromatin, in which the chromatin becomes visible. There are two identical copies of each chromosome in the cell also known as the sister chromatids. The sister chromatids are attached to

In Meiosis Metaphase 1 is similar to Mitosis stage one but differs as chromosomes form a double row at the equator of the spindle instead of a single row. Anaphase In Mitosis and Meiosis Anaphase; the centromere splits as a result the spindle contract further and the two chromatids of each chromosome separate and migrate to opposite ends. The spindle fibres are made of tubulin molecules and they shorten through the removal process.

Prophase-This is the first stage of mitosis, chromosomes that consist of two chromatids and condense

The main focus of this lab was to be able to understand the different phases of mitosis and the cell cycle and also identify what those stages may look like. Mitosis is the process in which concerns the production of new cells. For example, when apoptosis(cell death) the process of Mitosis begins to replace the dead cells. To be able to familiarize ourselves with this concept, we took a sample of an onion root and had it put through a process to be able to look at the different phases under the microscope. We found that the majority of the cells were mostly undergoing Interphase or Prophase which are the phases in charge of crossing over of DNA and where the chromosomes then become visible and the nuclear envelope dissipates. The conclusion of this lab was that Mitosis is essential for the production of new cells. In the case of the onion root sample, the cells were damaged leading to the tester to undergo Mitotic cell division and it was found that mainly Interphase and Prophase were the stages that occurred in this lab.

Mitosis, as defined by the Merriam Webster dictionary, is a process that takes place in the nucleus of a dividing cell. It involves a series of steps consisting of prophase, metaphase, anaphase and telophase. This results in the formation of two new nuclei each having the same number of chromosomes as the parent nucleus.

Mitosis is the first stage of the cell cycle. This is where chromosomes located in the nucleus, are divided evenly between two cells. Once the process of cell division is complete, the end result of mitosis is two identical daughter cells, with identical genetic material. Before mitosis occurs, the dividing cell experiences a period of growth, known as interphase. Interphase is the holding stages between two successive cell division; 90% of the time is in interphase and is the stage where cell division occurs.

The processes of mitosis and meiosis were examined along with their frequency as well as each of the different steps and their time duration. It was found that the interphase stage of both mitosis and meiosis was the longest of all the stages as this was where most of the ‘action’ was happening such as cell growth and duplication of all cell organelles and chromosome replication also. It was also found that mitosis and meiosis have similar stages, however, they also have a lot of differences such as the end result and what is happening throughout each stage.