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15 Cards in this Set
- Front
- Back
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What are the 2 different methods of differentiation?
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- Different genetic material between daughter cells
- Cytoplasmic/extracellular elements that influence expression are distributed unequally |
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What are the only cells without a complete genome?
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Gonads
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What is meant by the lineage model of cell differentiation?
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- Cell and progeny have intrinsic info determining phenotype
- Fate is FIXED from beginning - Mitotic division permits expression of new parts of genome |
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What is meant by the environmental model of cell differentiation?
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- External signals cause cells to differentiate as they do
- Fate is NOT FIXED |
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What is the only time at which individual chromosomes are visible?
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- During cell division
(otherwise packed as chromatin during interphase) |
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In which phase of the cell cycle are organelles made?
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G1 Interphase
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In which phase of the cell cycle do chromosomes duplicate?
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S Interphase
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In which phase of the cell cycle is energy stored?
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G2 interphase
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What stages comprise CELL DIVISION?
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Mitosis, cytokinesis
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What occurs during prophase & metaphase?
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Chromosomes coil, line up at middle of cell
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What occurs during anaphase & telophase?
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Sister chromatids separate and move to opposite sides.
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What occurs during cytokinesis?
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Cell divides to genetically identical cells.
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What is characteristic about chromosomes during Meiosis I?
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- Homologous chromosomes are paired
- Genetic info is CROSSED OVER |
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What is Meiosis II?
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- Essentially the same as mitosis
- 4 haploid daughter cells |
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Which phase contributes most to genetic variations?
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- MEIOSIS I:
- Large number of arrangements of chromosomes - Crossover |
