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Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
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- The structure that gives terminal : stability of chromosomes is Kintochore O Centromere and telomeres Centromere O telomere O2. What are ensured by G, and G, as well as metaphase checkpoints? 3. What happens during the G, phase? 4. What is the importance of the G,phase? 5. What is interphase? What are the events during this state? 6. What are the important events in each stage of mitosis? Refer to the illustration below.Prophase prometaphase metaphase anaphase telophase
- Describe the organization of the interphase nucleus. Include inyour presentation a description of chromosome territories andinterchromatin compartments ?The zipper-ike connection between paired homologs in early prophase is known as a O pindie ber, O recombination nodules kinetochore centromere naptonemal comelexDifference of metaphase from metaphase I
- The duplicated chromosomes are separated during: O Nucleosis O Cytokinesis II O Mitosis O CytokinesisWhich of the following structures are associated with the ends of chromosomes and may shorten over many cell divisions? histones telomeres spindles all of the above1 3 4 Here is a replication fork during S phase of the cell cycle. DNA strands are labeled 1-4. After mitosis and cytokinesis is complete, One daughter cell will have strands 18&2, another will have strands 3&4 One cell will have 1&3, the other will have 2&4 Each of the strands (1-4) will be in a different cell. All four strands will end up in the same cell, and the other cell will have the complementary strands. Both A and B are equally likely.
- Chromosomes per cell Chromosomes status DNA (molecules) per cell DNA picograms per cell Ploidy G1 ∞∞o 6 6 20 2n S G2 Prophase and prometaphase OO Metaphase Anaphase Telophase and cytokinesisIndicate the stage of mitosis (interphase = I, prophase = P, metaphase = M, anaphase = A, telophase = T) during which each of the following events occur. chromatid doublets separate to individual chromosomescentriole replicatesreplicated chromosomes (chromatid doublets) are arranged in single file next to one another at the cell's equatornuclear membrane is disappearingspindle fibers form and become visiblecell plate (plant) or cleavage furrow (animal) forms and is visiblechromosomes are at opposite poles of the cell; cytokinesis is almost completedchromosomes (chromatids) first become visible as long thin strandsDNA (chromosome) replication occursChromatin condenses and supercols. Name: The nuclear envelope is broken. Kinetochore microtubules appear. Name: Chromosomes aligned at the cellular equator. Name: