RG MEIOSISMutations

• What are chromosome mutations caused by?

  Errors in cell division
• In humans, when meiosis works properly, what do all 4 daughter cells end up with?

  23 whole chromosomes- one from each homologous pair (1 to 23)
• What happens to the cells produced when meiosis goes wrong?

  The cells produced contain variations in the number of whole examples or parts of chromosomes

  • CALLED CHROMOSOME MUTATION
• Give an example of a cell produced by meiosis containing variations in the numbers of whole chromosomes/parts of chromosomes?

  EG, 2 cells might have 23 whole chromosomes, one each of 1 to 23, but the other 2 may get muddled up, one having two chromosome 6's and the other no chromosome 6

  • CHROMOSOME MUTATION
• What is chromosome mutation caused by?

  Errors during meiosis
• What do chromosome mutations lead to?

  inherited conditions
• Why do chromosome mutations lead to inherited conditions?

  The errors are present in the gametes
• What is one type of chromosome mutation called?

  Non-disjunction- it is a failure of the chromosomes to separate properly.
• in humans what can lead to downs syndrome?

  Non-disjunction of chromosome 21 during meiosis
• describe non-disjunction?

  Homologous pair fails to separate
• When can non-disjunction also occur?

  In Meiosis II