1. Abnormal Meiosis
Biology 12

2. Running out of cell jokes…

3. 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

4. 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.

5. 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

6. 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
*Diagrams would be helpful!