Meiosis
Monday, 13 April 2015
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 primary 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.
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