Sister chromatids moving       k 
   to separate poles. 

Read the pages indicated by G-6, examine behavioral objective 9 and focus on the steps involved during  anaphase. 

Anaphase - Up to this time each chromosome consists of two sister chromatids held together at the centromere.  See figure below: 

 One chromosome two chromatids,      k 
 locate the centromere. 
 
 
 

                                                 k 
 

   Each sister chromatid has a kinetochore located at the centromere. The kinetochore grabs passing microtubules (spindles) as they invade the nuclear region. The spindles will pull the kinetochores apart during anaphase thus splitting the centromere. 
 

                                               k 
 

During anaphase the centromeres split and the chromatids are pulled by the spindles which are attached to the kinetochore located on the centromere. Sister chromatids are pulled to opposite poles of the cell. Using the figure above draw in your notes, the  three pair of chromosomes with the genes "A" and "B" on the log red and blue homologous pair as they would appear during anaphase. Follow  the same pattern you used  during metaphase. 
Click here if you want to revisit the metaphase figure.  click metaphase 

Click here to check answer.  click 

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