Different Stages Of Cell Division - 1139 Words

1) Cell division is typically explained through the progression of 4 distinct phases, G1, S, G2, and M, and can be tracked through CDK complex concentration ranges. CDKs are cyclin-dependent kinases, which regulate the cell cycle of eukaryotic cells; as suggested by the name, protein kinases are an enzyme that is dependent on cyclin for the regulation of cell division through the addition of phosphate groups. The different stages of the cell cycle correlate with different levels of cyclin and act as a threshold that once reached, triggers a phase transition. For example, for a cell to move out of G2 phase into M phase, Cyclin B interacts with the CDK1 complex, and causes phosphorylation to stimulate the phase shift; however, if the stage is not complete, the whole process slows down to accommodate the discrepancy in CDK complexes (Nelson Education, figure 9.17, page 191). This can be caused by several things, such as the presence of damaged or deformed DNA, or externally through con tact inhibition, where a delay in phase shift is caused by partial or incomplete contact of all cells. If there is only partial cell contact, contact inhibition will typically prevent progression past the G1 phase until there is complete cell contact, which can be reflected in variable levels of the CDK complex(Nelson Education, page 191). Overall, CDK regulates cell division through the combination of CDK and cyclin, the activation of protein via a phosphate group that triggers a phase change,Show MoreRelatedBiology Mitosis Lab1242 Words   |  5 PagesAP BIOLOGY- Mitosis and Meiosis Cell Division Lab Part 1-MITOSIS summary: In this experiment first the stages of an onion cell undergoing mitosis are going to be observed and every stage is going to be detected and drawn on paper. A brief description to what is going on should be attached to the pictures. This is important to understand the basics of cell division which is necessary growth,repairRead MoreComparing Mitosis and Meiosis Essay1218 Words   |  5 Pagessignificance Modern cell theory states that all cells are derived from other cells. This means cells must have a way of copying themselves. This is cell division; two types of cell division are Meiosis and Mitosis. The comparison will be between Meiosis 1 and Mitosis, because Meiosis 2 is much the same as Mitosis. Dividing cells have a regular pattern of events, known as the cell cycle. This cycle may be divided into two basic parts; The Interphase and the actual division (Meiosis / Mitosis)Read MoreInterview Sixth Grade Life Science Students On The Topic Of Cell Division1288 Words   |  6 Pageson the topic of cell division. Because I teach at a magnet junior high/ high school within Toledo Public students, the students I teach in the seventh grade are coming from a variety of different elementary schools both in and out of the district. This results in a wide variety of prior content knowledge in science. Based on the Ohio New Learning Standards for Science, in the sixth grade, students are introduced to the idea of mitosis and that cells come from pre-existing cells. However, basedRead MoreTypes Of Cell Division First Go Through Interphase Essay1587 Words   |  7 Pages Cell division Both types of cell division first go through interphase which has three stages. The cell grows in the G1 stage. It copies all of its chromosomes during the S phase, the two copies of the chromosomes are held together by the centromere resulting in an X shape. The last stage is preparing for division which is called G2 phase. After this is starts to divide in either mitosis or meiosis. 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It is easily observed in cells that are growing at a rapid pace such as whitefish blastula or onion root tips, which are used in this lab. The root tips contain an area called the apical meristem that has the highest percentage of cells undergoing mitosisRead MoreTypes Of Nuclear Division, Mitosis And Meiosis1559 Words   |  7 Pagestypes of nuclear division, mitosis and meiosis. Mitosis is usually used for the growth and replacement of somatic cells, while meiosis produces the gametes or spores used in an organism’s reproduction. Mitosis is the first of these studied in this lab. It is easily observed in cells that are growing at a rapid pace such as whitefish blastula or onion root tips, which are used in this lab. The root tips contain an area called the apical meristem that has the highest percentage of cells undergoing mitosis