Friday, April 17, 2015

Mitosis Limericks: Metaphase

Download the images for this post.

Here's the second in the series of mitosis limericks (see my previous post on prophase).  I'll be posting anaphase and telophase soon.  In the past I have used these in class to highlight important events during mitosis without showing cell images.  Students will see high quality images of mitosis in in their textbook.

My students always seem to have trouble understanding exactly what and where the kinetochores are (Background information).  Kinetochores are the place on the chromosome where microtubules (also called 'spindle fibers') attach.  At this site many proteins interact to form a connection between DNA and microtubules.  In most organisms the kinetochore forms in the region around the centromere.

The metaphase plate is an imaginary line near the center of a cell in mitosis.  The pairs of sister chromatids move toward this line because they are being pulled hard in opposite directions by microtubules originating from the poles of the cell.  Each pair of sisters is in the middle of a tug-of-war between two equally strong opponents.

I hope this is useful.  Two more limericks to go!

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