Meiosis Lab

This week in AP Biology we did a lab over meiosis. In the lab we had red and pink beads and a yellow magnet. With these things we had to make chromosomes and make an illustration with the beads to make them look like they are in interphase, prophase, metaphase, anaphase and telophase in mitosis and also the exact same but in meiosis. After that we had to get cards with a picture of crossing over. We had to count how many were in a 4:4 ratio or 2:2:2 ratio and so on and so forth. Once that was done, we would then have to find the percentages of ratios. The final thing we did was on the first day we started the lab, we put onion pieces in sand soaked in water and let them sit in a drawer for a few days, so the onions will start to grow tips.  We would then cut the tips and put them on a microscope slide with hydrochloric acid on the onion tip and then put it over a flame for 5 seconds. Once that was finished we had to put this special substance on the onion tip ( I forgot the name of it :(  ) and put it over a flame for about 2 minutes. We would then put it under a microscope a look to find the stages of interphase, prophase ,metaphase, anaphase and telophase.