Mitosis : Mitosis The beginning and the end for a cell.
Purpose of mitosis : Purpose of mitosis This old growth forest owes much of its appearance & diversity to mitosis. The power of mitosis cell division has pushed the crowns of these red woods hundreds of feet up. Many of the small fungi & unicellular animals that grow upon their bark & in the moist shade between their roots reproduce via mitosis
Mitosis or somatic division : Mitosis or somatic division The big idea to remember is that mitosis is the simple duplication of a cell and all of its parts. It duplicates its DNA and the two new cells (daughter cells) have the same pieces and genetic code. Two identical copies come from one original. Start with one; get two that are the same.
Preparation of mitosis : Preparation of mitosis The cell cycle consists of inter
-phase and cell
division. during s
and G 2 phases of interphase cell prepares for
mitosis
An animal cell during the G-2 stage of interphase : An animal cell during the G-2 stage of interphase Centrosome for support and transport has been replicated which organizes microtubules.nucleolus is visible and the nuclear envelope is intact.
Phases of mitosis : Phases of mitosis There are five (5) basic phases in the life-cycle of a cell. You should remember the term PMATI (pronounced PeeMahtEee). PMATI is the acronym for the phases of a cell's existence. It breaks down to. PROPHASE - METAPHASE - ANAPHASE - TELOPHASE - INTERPHASE
We suppose it would be good to know what happens during those phases. Always remember - PMATI!
Prophase : Prophase A cell gets the idea that it is time to divide. First, it has to get everything ready. You need to duplicate DNA, get certain pieces in the right position (centrioles), and generally prepare the cell for the process of mitotic division.
A micrograph of a cell in which DNA is blue and spindle is green : A micrograph of a cell in which DNA is blue and spindle is green
Slide 9 : The cell is in prometaphase .The chromosomes are being repositioned by the movements of the attached spindle fibers.
Metaphase : Metaphase Now all of the pieces are aligning themselves for the big split. The DNA lines up along a central axis and the centrioles send out specialized tubules that connect to the DNA. The DNA (chromatin) has now condensed into chromosomes. Two strands of a chromosome are connected at the center with something called a centromere. The tubules actually connect to the centromere, not the DNA.
Early anaphase : Early anaphase This cell is in early anaphase.The sister chromatids have separated and are moving toward opposite ends of the cell.
anaphase : anaphase The separation begins. Half of the chromosomes are pulled to one side of the cell; half go the other way. When the chromosomes get to the side of the cell, it's time to move on to telophase.
Telophase : Telophase Now the division is finishing up. This is the time when the cell membrane closes in and splits the cell into two pieces. You have two separate cells each with half of the original DNA. .
Regulation of mitosis : Regulation of mitosis
Regulation of Mitosis : Regulation of Mitosis In a normal cell p 53 bound to another protein & is inactive . When a mistake in mitosis is detected , the protein is released. Once activated , p 53 will either induce either a cell cycle arrest to allow for repair , or apoptosis to destroy the damaged cell. It is not known how p 53 make this choice.
Growth, Renewal, and Repair : Growth, Renewal, and Repair A seven week old human embryo . Although the cells of the developing fetus are differentiating into a wide array of cell types from brain to bone to blood to skin,each one is produced by mitosis & has the same genetic composition as all of the others.
Growth, Renewal, and Repair : Growth, Renewal, and Repair Repeated and rapid mitosis in the cells of this calf will allow it to grow to full size.
Growth, Renewal, and Repair : Growth, Renewal, and Repair A fresh wound (right) & the healed are (left). When an organism loses tissue due to injury, mitosis produces new cells to fill the gap.
Asexual Reproduction : Asexual Reproduction Kalanchoe plantets growing where the margin of a parent leaf is in contact with the ground. The mature plant & off spring have the same genetic make-up.
Budding : Budding Hydras are small fresh water predators topped with a ring of tentacles. This individual is in the process of budding a new organism from its body wall. When mature , the off spring will break of the parent.
Vegetative Propagation or reproduction : Vegetative Propagation or reproduction