Mitosis and Meiosis

Quick Revision notes on Mitosis and Meiosis

 

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  • Created by: Georgia B
  • Created on: 05-05-11 17:40

Mitosis

Mitosis!!!

There are 46 Chromosones

Found in the Nucleus

Before division, the cell Replicates DNA

Cell Splits

Creates 2 Identical Copies

Produces new cells to replace Damaged Ones

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Cell Division Process( Mitois)

Cell Division Process- Mitosis

DNA spread into Long Strings

Cell then Duplicates DNA

Chromosomes line up in centre of cell and cell fibres pull them apart

Membranes then form

The Cytoplasm Divides

They now have identical cells!

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Meiosis!

Meiosis

Gametes ( Sex Cells)

Half the number of Chromosomes

2 Chromosomes join during fertilisation

Now have full number of chromosomes

New cell is Unique

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Cell Division Process- Meiosis

Cell Division Process- Meiosis

Cell duplicates DNA

Chromosomes Line up in centre of Cell

Pairs of Chromosomes are pulled apart

Mixing up Mother and Fathers Chromosomes

Creates Genetic Variation

Chromosomes line up and pulled apart

4 gametes made containing half original number of chromosomes.

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Comments

Mazen

THANKYOUU!!! I NEED THESE SOO MUCHH TOP RATINGS

Hazzy B

This is very useful and oulines the key factors:)

raeesa

i hav gon thru meiosis nd meitoisis a billion and 1 tymmm nd neva hav i understood it until i read ur notessssssss....thnxxxx a millionnn these hlped lowadss :D x

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