Day 69: Yeast Budding Lab

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Science 9 – Today the students used some active yeast to observe asexual reproduction. The lab itself is quite straight forward and the students get a chance to practice laboratory skills: zeroing a scale and measuring mass, using a graduated cylinder, making a wet mount slide and using a microscope.

There are several hurdles for a large class.  First, there is little room and not enough equipment to keep all students involved and practicing the skills mentioned above.  Secondly, the budding is hard to identify at first.  A person needs to spend a while looking through the microscope before they will recognize the subtle differences in shape of the yeast as it is budding.  Lastly, students need considerable assistance in focusing on their slides.  To do properly, I feel that this lab requires one hour.  Some groups would finish it a lot sooner though.


Day 67: Asexual Reproduction


Science 9 – After covering many smaller details of cellular reproduction, today we finally hit some of the Big Ideas.  The above is one of them.  No, I didn’t give them notes!  The students were asked to answer some questions for themselves, and this was sort of an answer key I had ready for them to check their work. It can be very difficult to have group discussions in one of my science 9 classes, so I have to rely on students doing their work and checking in on their understanding.

Another Big Idea: