Chromosomes And Mitosis
- Created by: Nashi
- Created on: 20-03-17 16:05
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- Chromosomes And Mitosis
- Chromosomes
- Each Chromosome Carries A Large Number Of Genes
- Chromosomes Are Coiled Up Lengths Of DNA Molecules
- Different Genes Control The Development Of Different Characterist-ics
- Example: Hair Colour
- Body Cells Normally Have 2 Copies Of Each Chromosome
- 1 From The Mother And One From The Father
- Most Cells In Our Body Have Nucleuses
- Contains Genetic Material In The Form Of Chromosomes
- There Are 23 Pairs Of Chromosomes In A Human Cell
- The Cell Cycle
- The Stage Of The Cycle When The Cell Divides Is Called Mitosis
- Body Cells In Multicellular Organisms Divide To Produce New Cells
- Multicellular Organisms Use Mitosis To Grow/Replace Cells That Have Been Damaged
- Makes New Cells For Growth, Development And Repair As Part Of The Cell Cycle
- The End Of The Cycle Results In 2 New Identical Cells To The Original Cell, With The Same Number Of Chromosomes
- 2 Main Stages Of The Cell Cycle Are:
- Mitosis
- Growth And DNA Replication
- Mitosis
- Chromosomes Line Up At The Centre Of The Cell And Cell Fibres Pull Them part
- The 2 Arms Of Each Chromosome Go To Opposite Ends Of The Cell
- Membranes From Around Each Of The Sets Of Chromosomes
- These Become The Nuclei Of The 2 New Cells-The Nucleus Has Divided
- Lastly, The Cytoplasm And Cell Membrane Divide
- The Cell Has Now Produced 2 New Daughter Cells
- The Daughter Cells Contain Exactly The Same DNA-They're Identical
- Their DNA Is Also Identical To The Parent Cells
- The Daughter Cells Contain Exactly The Same DNA-They're Identical
- The Cell Has Now Produced 2 New Daughter Cells
- Growth And DNA Replication
- Before It Divides, The Cell Has To Grow And Increase The Amount Of Subcellular Structures
- Examples: Mitochondria Ribosomes
- Each 'Arm' Of The Chromosome Is An Exact Duplicate Of The Other
- Left Arm Has The Same DNA As The Right Arm Of The Chromosome
- In A Cell Thats Not Dividing, The DNA Is All Spread Out In Long Strings
- It Then Duplicates Its Dna-So There Is 1 Copy For Each New Cell
- The DNA Is Copied And Forms X-Shaped Chromosomes
- Before It Divides, The Cell Has To Grow And Increase The Amount Of Subcellular Structures
- Chromosomes
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