Phase Contrast
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What is the contrast between Telophase in plants and animal mitosis?
Plus if anyone can also answer any of these questions, it would be a great help, seriously!
THANKSS in Advance!
1) What experimental technique is used to demonstrate the existance of the 'S' phase in the cell cycle?
2) What is the major chromosomal event which occurs between leptotene (prior to pairing) and zygotene (pairing process) stages of prophase1 of meiosis?
ALL HELP GREATLY APPRECIATED!
Telophase (sometimes spelled telephase) is a stage in either meiosis or mitosis in a eukaryotic cell reversing the effects of prophase and prometaphase events. During those events, the nucleus was dissolved and the chromatin in the cell was condensed into chromosomes. Telophase thus "cleans up" the secondary after effects of mitosis.
Mitosis is the process by which a cell separates its duplicated genome into two identical halves. It is generally followed immediately by cytokinesis which divides the cytoplasm and cell membrane. This results in two identical daughter cells with a roughly equal distribution of organelles and other cellular components. Mitosis and cytokinesis together is defined as the mitotic (M) phase of the cell cycle, the division of the mother cell into two daughter cells, each the genetic equivalent of the parent cell.
Mitosis occurs exclusively in eukaryotic cells. In multicellular organisms, the somatic cells undergo mitosis, while germ cells — cells destined to become sperm in males or ova in females — divide by a related process called meiosis. Prokaryotic cells, which lack a nucleus, divide by a process called binary fission.
1.The S phase, short for synthesis phase, is a period in the cell cycle during interphase, between G1 phase and the G2 phase. Following G1, the cell enters the S stage, when DNA synthesis or replication occurs. At the beginning of the S stage, each chromosome is composed of one DNA double helix molecule, which is called a chromatid. At the end of this stage, each chromosome has two identical DNA double helix molecules, and therefore is composed of two sister chromatids. During S phase, the centrosome is also duplicated. These two events are unconnected, but require many of the same factors to progress. The end result is the existence of duplicated genetic material in the cell, which will eventually be divided into two.
Damage to DNA often takes place during this phase, and DNA repair is initiated following the completion of replication. Incompletion of DNA repair may flag cell cycle checkpoints, which halts the cell cycle.
Tags: contrast, microscope, microscopia, microscopy, phase contrast imaging, phase contrast microscopy, phase contrast mr, phase contrast mri, phase contrast objective, x-ray
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