Meiosis

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 Meiosis video links: 

https://www.youtube.com/watch?v=qCLmR9-YY7o 

https://www.youtube.com/watch?v=16enC385R0w 

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Crossing Over and Recombination

Crossing over occurs during Prophase I. Two chromosomes pair up and exchange DNA allowing for genetic diversity between parents.

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Independent Assortment

Independent Assortment is a process unique to meiosis and occurs in Metaphase I.

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Meiotic Nondisjunction Events

Nondisjunction video link

• A failure of chromosomes/chromatids to separate during cell division.There are three different types:
  • Homologous chromosomes fail to separate in meiosis I
  • Sister chromatids fail to separate in meiosis II
  • Sister chromatids fail to separate in mitosis

Sister chromatids failing to separate in meiosis II (above left) and                                      Homologous chromosomes failing to separate in meiosis I (above right)

Link to Cells and The Cell Cycle Review

Link to Mitosis Review

Link to Meiosis Review