Discuss in Detail the Cell Cycle, Mitosis and Meiosis.

1007 Words Feb 17th, 2013 5 Pages
Discuss in detail the Cell Cycle, Mitosis and Meiosis.

Cells have the ability to grow, have particular functions, and replicate during their life. Although cell enlargement is part of organismal growth, cell replication is also required and allows growth without each cell becoming too large. All of these activities are part of a repeating set of events known as the cell cycle. The major feature in the cell cycle is cellular replication and what enables for cellular replication is the process of mitosis. Mitosis is the only part of the cell cycle, and the remainder of the cycle consists of interphase, cytokinesis, gap 1, synthesis, and gap 2 phases. But cell division and reproduction can occur in two ways mitosis (which I just
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After the two successive divisions of meiosis, a single cell will produce four cells each having the haploid number of chromosomes. Prophase I of meiosis begins with the condensation of chromosomes, and the vesiculation of the nuclear membrane. Centrosomes, which duplicate at the beginning of meiosis, begin moving apart and the spindle fibers begin forming. Early in prophase, synaptonemal complexes form and the homologous chromosomes are seen to align next to each other to form a structure called a bivalent. A bivalent is composed of four sister chromatids and crossing will occasionally occur between homologous chromatids within a bivalent. During prometaphase I, the spindle fibers continue to form and bivalents become attached to kinetochore microtubules. One pair of sister chromatids is connected to one pole while the homologous pair sister chromatids are connected to the opposite pole. The complete assembly of the spindle fibers occurs during prometaphase I. The chromosomes, bivalents, align at the metaphase plate at metaphase I. Then, anaphase I involves the separation or disjunction of homologous chromosomes with each pair of sister chromatids moving to the opposite pole of the cell. When the conjoined sister chromatids reach the poles of the cell, they detach from the spindle fibers and the nuclear membrane begins to form. A cleavage furrow forms and cytokinesis results in two cells having the haploid chromosome number with each chromosome consisting of a pair of

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