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Meiosis and Mitosis PowerPoint Presentation

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Description : MEIOSIS AND MITOSIS

Tags : mitosis

Published on : Jan 08, 2023 | Views : 505 | Downloads : 0

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MEIOSIS AND MITOSIS By: Foaad Ahmad B.Sc.. Of Pharmacy
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Meiosis Meiosis is a type of cell division that results in the formation of four daughter cells each with half the number of chromosomes as the parent cell. Meiosis is the form of nuclear cell division that results in daughter cells that have one-half the chromosome numbers as the original cell. In organisms that are diploid, the end result is cells that are haploid. Each daughter cell gets one complete set of chromosomes, i.e., one of each homologous pair of chromosomes. In humans, this means the chromosome number is reduced from 46 to 23. The germ cells undergo meiosis to give rise to sperm and eggs. The joining together of a sperm and egg during fertilisation returns the number of the chromosomes to 46. Cells that undergo meiosis go through the cell cycle, including the S phase, so the process begins with chromosomes that consist of two chromatids just as in mitosis.
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Mitosis Mitosis is the type of cell division that results in the formation of two daughter cells each with the same number and kind of chromosomes as the parent cell Mitosis is a continuous process of cell division which occurs in all types of living cells. Mitosis involves four basic phases – prophase, metaphase, anaphase and telophase. Mitosis is the process where the division of cell occurs by asexual reproduction. In mitosis, the nuclear membrane is broken down, spindle fibres (microtubules) attach to the chromatids at the centromere and pull apart the chromatids. Each nucleus is identical to the original nucleus as it was in G1 phase.
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Difference btween mittosis and meiosis Mitosis was discovered by Walther Flamming, while meiosis was discovered by Oscar Hertwig. Cytokinesis occurs only in telophase during mitosis, while it occurs in Telophase 1 and telophase 2 during meiosis. The primary function of mitosis is general growth and repair. It is also used for cell reproduction. Tetrad formation is not observed in mitosis. Tetrad formation is observed in meiosis. Meiosis, on the other hand, aims to provide genetic diversity through sexual reproduction.
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State a few similarities between mitosis and meiosis. Mitosis and meiosis take place in the cell nuclei. Both involve cell division. Both the processes occur in the M-phase of the cell cycle. In both cycles, the stages are common – prophase, metaphase, anaphase and telophase. Synthesis of DNA occurs in both.