Learning Objectives:1. Explain how gametes are made by

meiosis2. 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!

Wednesday 3 May 2023Meiosis

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 MeiosisWhere does it occurNumber of divisionsCreates

Number of chromosomes Produces

Function

Similarities and differences between meiosis and mitosis

Mitosis MeiosisWhere does it occur All over the body Sex organsNumber 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