Abnormal Meiosis Biology 12.

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Presentation transcript:

Abnormal Meiosis Biology 12

Running out of cell jokes…

Abnormal Meiosis: 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

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.

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

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!