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25 Cards in this Set
- Front
- Back
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Cell Cycle?
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series of events that take place in a cell leading to its division and duplication
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What are the 4 phases of the cell cycle?
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G1 phase, S Phase, G2 Phase, M Phase
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G1 Phase?
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growth and preparation of the chromosomes fro replication
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S Phase?
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synthesis of DNA (replication and duplication of the centrosome)
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G2 Phase?
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preparation for Mitosis
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M Phase?
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Mitotsis and cytokinesis
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What are the 4 Phases of Mitosis?
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Prophase
Metaphase Anaphase Telophase |
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What happens in Prophase? 5
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-chromatin condenses into discrete chromosomes
-nuclear envelope breaks down -centrioles move to oppposite ends of the cells -fibers extend from centromeres -spindles form at opposite poles |
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What happens in Metaphase?
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-spindle fibers align the chromosomes along the middle of nucleus
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What happens in Anaphase?
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paired chrosomes seperate at the kinetochores and move to opposite ends of the cell
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What happens in Telophase? 3
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chromatids arrive at oppositive poles of cell
-new membranes form around daughter nuclei -spindle fibers disperse |
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What happens during Cytokinesis?
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actin forms a ring around the center of the cell then contracts. This pinches the cell into 2 daughter cells
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What causes Cytokinesis in animal cells?
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actin & myosin
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What causes Cytokinesis in plant cells?
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early cell plate
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What is the longest phase of Meiosis?
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Prophase
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Chiasmata?
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the sites of crossing over of non-sister chromatids that are seen as crisscrossed
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What is Meiosis I?
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Reductional Division
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What is Meiosis II?
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Equational Division
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What are the phases of Meiosis I? 5
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Prophase I, Metaphase I, Anaphase I, Telophase I, Cytokinesis
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Meiosis: Prophase?
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-chromosomes coil and become shorter and thicker
-homologous chromosomes pair along their lengths |
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Synapis?
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process of pairing the homologous chromosomes
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Meiosis: Metaphase?
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homologous chromosomes align along an equatorial plane that bisects the spindle
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Kinetochore microtubules?
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microtubules attached to kinetochores
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Meiosis: Anaphase?
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2 chromosomes of each tetrad separate and start moving toward opposite poles of the cell due to the action spindle
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oogenesis?
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creation of an ovum or egg
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