Term
| Mitotic spindle is made of.. |
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Definition
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Term
| Cell division in which there is first a duplication of chromosomes followed by migration of chromosomes to the poles and dividing of the cytoplasm. |
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Definition
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Term
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Definition
Prophase, metaphase, anaphase, telophase
A cell not undergoing division is in the "resting stage", or interphase. |
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Term
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Definition
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Term
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Definition
A. Chromsomes are diffusely distributed throughout the nucleus
B. One or mroe nucleoli are seen.
C. DNA synthesis occurs late in this stage. |
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Term
| An area rich in nucleolar organizing proteins that organize DNA so as to maximize the efficiency of RNA production, particularly that needed for rRNA production. |
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Definition
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Term
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Definition
1. Chromosomes begin to contract at the same rate; thereby, keeping a length relatively similar to the others
2. Chromsomes are clearly doubled (2 chromatids)
3. NUcleolus and nuclear membrane disappear |
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Term
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Definition
1. Chromosomes line up on equatorial plate
2. centromers are positioned on the equator
3. Spindle fibers extend from the centromeres to the poles. Centrioles are oriented toward opposite poles of the spindle apparatus (in animals).
4. The centromeres become functionaly double. |
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Term
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Definition
| 1. Sister chromatids disjoin and travel to opposite poles and become chromsomes. |
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Term
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Definition
1. Chromosomes uncoil, lengthen and become indistinguishable.
2. Nuclear membranes and nucleolus reappear.
3. Cytokinesis or cytoplasmic division begins and eventually results in two daughter cells with identical genetic material (cell plate) |
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Term
| The first meiotic division results in separation of ______ |
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Definition
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Term
| The physical exchnage of genetic information between homologous chromosomes as they are paired. This occurs during: |
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Definition
Recombination
Prophase I: Zygotene |
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Term
| As a result of partial separation, chiasmata (physical manifestation of recombination) become visible. In which stage of Prophase I is this? |
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Definition
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Term
| Prophase I is divided into five substages: |
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Definition
leptotene, zygotene, pachytene, diplotene, diakinesis
LAZY PADDY |
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Term
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Definition
| Initial condensation and coiling of chromosomes, which appear as long and threadlike. |
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Term
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Definition
| Homologous chromosomes have begun to pair and synapse laterally into bivalents or tetrads. The synaptonemal complex forms here. |
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Term
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Definition
Synapsis is complete, and bivalents have become shorter and thicker. Synaotonemal complex holding the homologous chromosomes together.
Crossing over occurs here. |
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Term
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Definition
| The chromosomes of each bivalent begin to undergo repulsion near the centromere. Chiasmata become visible. |
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Term
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Definition
| Maximally condensed and coiled chromsoeomes. Nuclear envelope fragments and nucleoli disperse. |
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