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Meiosis
Thursday, 06 July 2017
Learning Objectives:
1. Explain how gametes are made by meiosis
2. Describe differences and similarities
between mitosis and meiosis
Starter
Draw and label a sperm and egg cell in your
book – don’t look back in your book! 
Meiosis
• A special type of cell division producing
gametes
• Happens in sex organs
– Ovaries and testes
• Gametes contain half the number of
chromosomes. This is called haploid
• Meiosis results in variation
http://www.cellsalive.com/meiosis.htm
Stages of meiosis
2 Main stages
1. Homologous chromosomes separated.
Creates 2 daughter nuclei
2. 2 daughter nuclei divide. Chromosomes
themselves are seperated. Creates 4
gametes.
Activity
• Using pipe cleaners (4 different
colours) OR string – model the stages of
meiosis
• Do this in your book.
• Label your diagrams
Similarities and differences
between meiosis and mitosis
Mitosis
Where does it occur
Number of divisions
Creates
Number of chromosomes
Produces
Function
Meiosis
Similarities and differences
between meiosis and mitosis
Mitosis
Meiosis
Where does it occur
All over the body
Sex organs
Number of divisions
1
2
Creates
All cells apart from
gametes
Gametes
Number of
chromosomes
46 (diploid)
23 (haploid)
Produces
Two cells
Four cells
Function
Cellular reproduction,
growth
Sexual reproduction
To finish off..
Unscramble these keywords.
The person who finishes first can go first
today!
odidlpi aidonritochm pldhaio semoroca
soiisem toissmi emocshomro