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18 Cards in this Set
- Front
- Back
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In a cell that is not dividing, the uncoiled DNA has a ___________appearance when viewed with the electron microscope; when the cell begins to divide, this material condenses and the chromosomes become _________. |
* granular appearance *visible as distinct structures |
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The cell cycle of a typical body cell consists of____________and cytokinesis |
Mitosis |
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Chromosomes are duplicated during the ___________phase of mitosis |
*synthesis phase |
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An animal with a diploid number of 20 chromosomes will have __________chromsomes inits gametes and ____________chromosomes in its body cells. |
10 in gamets 20 body cells |
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What eveolutionary advantage is provided by meiosis? |
Meiosis helps to adapt to environmental changes over time |
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Generation time refers to: |
the time it takes one cell to become two |
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List three events that occur during prophase: |
*Chromosome compaction *Chromatin condenses *Chromosomes duplicate *Forms visible chromosomes *Mitotic spindle begins to form |
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Along with polare bodies two otehr prodcuts are produced by meiosis. Name those products. |
Spermatogenesis Oogenesis |
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During which pase does crossing over ocur? |
Prophase I |
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During which stage of meisois do teh sister chromatid separate? |
Anaphase |
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The formation of female gametes is termed: |
Oogenesis |
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In which phaase of mitosis are the chromosomes lined up at the equator. |
Metaphase |
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What happens to the polar bodies that are produced during Oogenesis? |
*end of meiosis I, one nucleus is retained and the other called the first polar body often degenerates *End of meiosis II, one nucleus becomes another polar body and the other nucleus survives |
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Does DNA replicate in Interkineis: |
No |
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Homologous chromosomes come together or pair during which phase of meiosis? |
Prophase I |
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Sister chromatid are pairs of identical unites held together by their___________. |
Centromere (tightly bound proteins) |
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The _________aid in separation of the sister chromatid during anaphase of mitosis. |
The kinetochore microtubules and the spindle |
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During which state of meiosis do the sister chromatid separate? |
Anaphase |
