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Mitosis & Meiosis
Ch. 25: Perpetuation of the Species
Question | Answer |
---|---|
Diploid | State in which every chromosome of a cell has a Homologue |
Haploid | State in which each of the 26 chromosomes lacks a homologous counterpart |
Interphase | The period in a cell's life cycle between periods of mitosis |
G1 phase | Gap phase |
S phase | Synthesis phase |
G2 phase | Growth phase |
Cytokinesis | Cytoplasmic division |
Mitosis stages (4) | Prophase, Metaphase, Anaphase, Telophase |
Centromere | Joins together each pair of duplicate chromosomes |
Chromatid | One member of the pair of chromosomes |
Prophase | The chromosomes condense to the point they are visible under light microscope as x shaped structures. The nucleolus slowly disappears. Centrioles move to opposite poles of the cell. Microtbules give rise to the mitotic spindle. |
Metaphase | Marked by complete dissolution of the nuclear membrane. The chromosomes line up at the metaphase plate with the help of kinetochore fibers. |
Daughter chromosome | When sister chromatids are separated |
Anaphase | Sister chromatids separate (as a result of the splitting of the centromere) and move toward opposite poles of the cell. |
Telophase | Daughter chromosomes are positioned at opposite poles of the cell. A nuclear membrane forms around each set of daughter chromosomes. The chromosomes decondense and are no longer visible. Nucleoli reappear. |
Cleavage furrow | Occurs during cytokinesis to divide the cell |