Presentation on theme: "What do cells spend their time doing? Why do they do this?"— Presentation transcript:
1 What do cells spend their time doing? Why do they do this? N-6 Cell DivisionWhat do cells spend their time doing? Why do they do this?
2 Cell Cycle: The regular sequence of growth and division that happens in cells
3 Stage 1: InterphaseDuring interphase, the cell grows to its mature size, makes a copy of its DNA, and prepares to divide into two cellsGrowth – during the first part of interphase, the cell doubles in sizeDNA Replication – the cell makes a copy of its DNA in the nucleus. This means that there are TWO copies of the DNA (instructions) in each nucleusCells spend 90% of their lives in this stage
4 Stage 2: MitosisDuring mitosis, one copy of the DNA is distributed into each of the two ‘daughter’ cells.This is divided into four parts:ProphaseMetaphaseAnaphaseTelophase
5 Chromosomes: (humans have 23 pairs) DNACentromereTwo Chromatids
7 Mitosis - MetaphaseChromosomes line up in center of the cell
8 Mitosis - AnaphaseChromatids are pulled to opposite ends of the cell
9 Mitosis - TelophaseNew nuclear membranes form around each new set of chromosomes
10 Stage 3: CytokinesisThe cell membrane ‘pinches’ together in the middle of the cell forming two ‘daughter’ cells.Cytoplasm divides, distributing the organelles into each of the new cells.
11 Can we identify the following? ProphaseMetaphaseCytokinesisTelophaseAnaphaseAna or Telo?Interphase10
12 DNA ReplicationDNA Replication ensures that each daughter cell will have all of the genetic information it needs to carry out its activities.There are four pieces of the puzzle:Adenine and ThymineCytosine and GuanineThe order that these ‘pieces’ fit together determine our genetics!Animation
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