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Abnormal Meiosis. Biology 12. Running out of cell jokes…. There are genetic abnormalities that result from errors during meiosis Chromosomes do not separate properly during either anaphase I or II. So some gametes have too many or too few chromosomes

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abnormal meiosis1

There are genetic abnormalities that result from errors during meiosis

    • Chromosomes do not separate properly during either anaphase I or II.
    • So some gametes have too many or too few chromosomes
    • Many of these gametes will die
    • Some may live and have genetic disorders
Abnormal Meiosis:
nondisjunction

Is when two homologous chromosomes move to the same pole during meiosis

  • One cell gets both the homologous chromosomes and the other gets neither of these chromosomes
  • The result is that all cells in this organism will have this abnormality.
Nondisjunction:
to do

Complete notes from book on the terms on the next slide

  • Nondisjunction Colouring sheet (colour and/or label)
  • Prenatal Diagnosis Options Assignment
      • Due Mon Oct 1st
To do:
record in your notes a definition including what happens to which chromosomes for the following

Trisomy

  • Monosomy
  • Down Syndrome
  • Klinefelter Syndrome
  • Turner Syndrome
  • Multiple marker screen

*Pages 116-121

*Diagrams would be helpful!

Record in your notes a definition, (including what happens to which chromosomes) for the following:
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