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Cell Division & Cell Cycle and its phases

by Admin
October 4, 2019
Reading Time: 6min read
0

CELL DIVISION & CELL CYCLE – THE CONTINUATION OF LIFE

Life on the earth is due to Cell division & cell cycle. Different phases of Cell division & Cell Cycle are described below:

·       The earth is teeming with countless living cells. 
·       You have 100 trillion cells in your body alone.
·       They are …. you.
·       Cell comes in all sizes and shapes. 
·       They perform thousands of different tasks in the life forms of earth.
·       They work together to form the tissues of all living things.
·       But cell don’t live forever. Eventually they die.
·  Fortunately, they have ability to reproduce through a process called cell division.
·      It begins a chemical signal to prepare for reproduction. The cell grows larger. It is called “G1 Phase” of cell’s life.
·       After growth, the cell duplicates it s DNA. This is called the “S Phase” of the cell cycle.
·      The DNA is then checked by enzymes for mistakes & repaired. This is “G2 Phase” of cell cycle.
·   When ready cell division begins . It is called “Mitosis” and the cell division.
·  Mitosis begins when the nuclear membrane dissolves and DNA thickens called (Prophase).
·     Special fibers called spindle fibers form on each end of the cell and grow towards the DNA chromosomes.
·     The fiver then attach to centromeres on the chromosomes and pull them into a line in the middle of the cell called (Metaphase).
·    The chromosomes are pulled apart by the spindle fibers to opposite sides of the cell called (Anaphase).
·     Lase is Telophase. Two new nuclei form the cell and then divides in two called Cytokines.
·       all of us started life as single cell that divided again and again.
·       But the first cell experienced something special… SEX.
·       The cells involved in SEX are produced by a process called Meiosis.
·       Cell division & cell cycle – the continuation of life.

 

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