6th Hour's Crossing Over Lab

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  • Mr. Mayer is having his 6th hour Honors Biology class at Regina take a closer look at cells undergoing crossing over in meiosis.
  • Today, we will be using this microscope behind me to observe a cell's crossing over during meiosis.
  • In the nucleus, you can see that the homologous chromosomes became aligned after synapsis but still have not intertwined.
  • The duplicated sister chromatids prepare to cross over.
  • If you look closely, you will notice that the chromatids are now crossed.
  • In this phase, the nonsister chromatids join by crossing and overlapping one another.
  • The nonsister chromatids have broken apart and rejoined, mixing with each other.
  • Now, class, you can see that the pairs which were once two separate sister chromatids are now intertwined.
  • The two resulting daughter chromosomes will have a different combination of genetic material than they had before.
  • As you can see, the process of crossing over has now finished.
  • The lab was successful in giving the girls a new understanding of meiosis and, specifically, crossing over. The end!
  • So, Brooke, do you think you could easily pass a pop quiz given to you right now on crossing over?
  • I feel so ready that I could graduate right now and get my diploma, Mr. Mayer.
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