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Cell Division

Transcript: - duplicate the DNA within each cell during every cycle of cell division Cytokinesis,r:54,s:0,i:249 hh Anaphase - The chromosomes begin to stretch out and lose their rod like appearance. This occurs in the two regions at the ends of the cell. A new nuclear membrane forms around each region of chromosomes. - each identical rod, or strand of chromosome - they separate from each other and move to opposite ends of the cell DNA Ladder- Deoxyribose and Phosphate How the cell grows and matures Chromosomes and Chromatids,r:1,s:0,i:113 - During cytokinesis, the cytoplasm divides, distributing the organelles into each of the two cells - what a DNA molecule is most often called based on its twisted ladder like shape Metaphase A cell dividing into two daughter cells. Double Helix Chapter 2.5 Cell Cycle of Mitosis Nitrogen Bases Telophase,r:41,s:0,i:67 - The centromeres split. The two chromatids separate. One chromatid moves along the spindle fiber to one end of the cell. The other chromatid moves to opposite end. The cell becomes stretched out as the opposite ends pull apart. Sources,r:0,s:0,i:152 - Why do we need DNA replication?? - it insures that each daughter cell will have all of the genetic info it needs to carry out activities - The chromosomes line up across the center of the cell. Each chromosome attaches to a spindle fiber at its centromere, which still holds the chromatin together - molecules of sugar that the two sides of the DNA ladder are made up of alternating between each other Base Pairings - Adenine ----> Thymine - Guanine ----> Cytosine - each doubled rod of condensed chromatin - the cell grows when it doubles in size during the first part of Interphase and makes a copy of its DNA. - The cell is mature when it is fully developed physically and is ready to divide DNA Replication,r:3,s:0,i:158 - The chromatin in the nucleus condenses to form chromosomes. Structures called spindle fibers form a platform between the ends of the cell. The nuclear membrane breaks down. Prophase By Madi W. R3 Science

cell Division

Transcript: Mitosis Mitosis or M Phase: Cell growth and protein production stop at this stage in the cell cycle. All of the cell's energy is focused on the complex and orderly division into two similar daughter cells. Mitosis is much shorter than interphase, lasting perhaps only one to two hours. As in both G1 and G2, there is a Checkpoint in the middle of mitosis (Metaphase Checkpoint) that ensures the cell is ready to complete cell division. Actual stages of mitosis can be viewed at Animal Cell Mitosis. cytokinesis Cytokinesis: The spindle fibers not attached to chromosomes begin breaking down until only that portion of overlap is left. It is in this region that a contractile ring cleaves the cell into two daughter cells. Microtubules then reorganize into a new cytoskeleton for the return to interphase. telophase anaphase Anaphase: Spindle fibers shorten, the kinetochores separate, and the chromatids (daughter chromosomes) are pulled apart and begin moving to the cell poles. interphase Interphase: Cells may appear inactive during this stage, but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates, the centrioles divide, and proteins are actively produced. For a complete description of the events during Interphase, read about the Cell Cycle. cell cycle prophase Prophase: During this first mitotic stage, the nucleolus fades and chromatin (replicated DNA and associated proteins) condenses into chromosomes. Each replicated chromosome comprises two chromatids, both with the same genetic information. Microtubules of the cytoskeleton, responsible for cell shape, motility and attachment to other cells during interphase, disassemble. And the building blocks of these microtubules are used to grow the mitotic spindle from the region of the centrosomes.

cell division

Transcript: Cell Division!! Video for cell division. Meiosis This is the chance for the cell to grow and reproduce. There are two different types of cell division. They are; mitosis, and meiosis. In this the DNA combines of the mother and father. The male cell, sperm, and the female cell, egg. Mitosis is mainly seen a lot in many animals and plants. This is when the cell grows and divides. When the cell gets to large it uses mitosis to make itself smaller in size. This divides only once and repeats. Cell division Sexual reproduction. The steps to cell division. Meiosis is when the cell needs a male or female cell so it can make another cell. There are two different types of meiosis. They are; meiosis 1, and meiosis 2. Meiosis 1 In this, the cell only divides once. One cell has the same amount of male chromosomes as the female chromosomes. There are only two haploids. Meiosis 2 In this, the cell divides another time. The cells have to pinch a piece off each other so they have some of that DNA. Then there are 4 haploids. Asextual reproduction By: Rebecca Roberts and Destiny Jenkins Mitosis Thank you for watching! THE END Interphase- Chromosomes are doubled, and then turn into long strands of thread. At the end of this phase there will be sister chromosomes. Prophase- Then the cells start to divide. The poles appear and begin to move to opposite ends of the cell. Spindle fibers form that are attached to the poles. Metaphase- In asexual reproduction the cell copies itself to make another cell. This is mainly seen in plants; not so much in animals. This is basicly mitosis. When the cell gets to big it uses asexual reproduction. Basicly what this means is that you only need the one cell. No female or male cell needed.

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