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25 Cards in this Set

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