Grading Presentation

My Principal asked me to share my practices around grading at our Staff Development day on Friday March 14. The focus of the day was on assessment and grading. As a district we will be making the shift to Proficiency-Based Grading. It is mandated by the State of Maine that students graduating in 2018 will need to have a proficiency-based diploma. My grading philosophy has been heavily influenced by standards-based practices. Over the last several years I’ve experienced tremendous mental dissonance as my classroom practice has not jives with my philosophy.
This year I made a some progress in reconciling that dissonance. I was inspired by Frank Noschese’s post The Spirit of SBG last June. In my Human Anatomy & Physiology course I’ve started organizing my units around 2-4 major learning objectives. I quiz my students on one learning objective at a time. I’ve developed a system for students requesting retakes using a Google Form and a script within the Google Spreadsheet to email me every time there is a new response. In the last couple years I’ve started writing my tests a that all the questions about the same learning objective are grouped together, rather than grouping by question type (multiple choice, matching, labeling, short answer, and essay). I also report out sub-scores by learning objective. Eventually I’d like to make the quizzes purely formative, but I’m not there yet.
I received positive feedback and thank you’d from my colleagues. I think the next few years are going to generate great dialogue around the school because I work with a fantastic group of educators. I would like to see my school reinstitute cross subject area professional learning groups with distinct purpose if discussing assessment and grading. It was beneficial to talk with my colleagues from other content areas in previous. Over the last five years, the previous principal slowly cut the numbers of these meeting during our Wednesday morning professional development time from one meeting monthly to 0. My slideshow is embedded below.

 

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DNA Extraction

I’m in the middle of the Cell Unit now. We’ve already established the structure and function of the cell membrane and are now working on the structure and function of the nucleus. The Cheek Cell Lab went off without a hitch and the post-lab discussion revealed that my kids remembered that the nucleus was the “control center” of the cell and it contained DNA. One class remembered that the letters for DNA were A,T,C,G. At this point we transitioned to the DNAi.org Activity about DNA structure. Next year I think I will add in a DNA Extraction Lab in between the Cheek Cell Lab and the DNAi.org Activity. I find that students “get” DNA better after they have seen actual DNA. In the past I’ve used a strawberry DNA Extraction from the Exploring Life Textbook by Campbell, Williamson et. al. One of the other teachers in the department does an extraction using cheek cells and a “mouthwash” solution. I think I’ll try to combine these two labs together. I really like the idea of extracting DNA from cheek cells after the kids observed their own cheek cells under the microscope. The kids will get a macro view of DNA from the abstraction and we can then transition to a micro view of DNA with the DNAi.org Activity. Later this Spring or in the Summer I’ll purchase the DNA model kits depending on when the district frees up some money.

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Teaching Socratic Questioning Strategies with Hedbanz

I was walking by the classroom of a colleague when one of my students who happened to be in that class called out to me, “Am I alive?”.  The students were playing the game Hedbanz, and she happen to have a tomato on her forehead.  If you are not familiar with game Hedbanz, it is a game were students ask questions of each other in an attempt to determine the picture on the card that is held by a headband on their forehead.  I asked my colleague if he was using the game to teaching questioning to his students.  He replied no, he was using it to teach the concept of capitalism.  The kids were playing a number of different quick games to determine which one most closely matched the concept of capitalism that is exemplified by Monopoly.  Playing Monopoly would just take way too long.  I talked with him about how I’ve been working with my students to get them to ask each other questions.  Students asking questions of each other is a huge part of Modeling Instruction, and my students and I have been really struggling with question asking this year.  He suggested making my own cards and playing a variation of the game.  I think there is a great deal of merit to this idea.  Now I need to think of pictures to place on the cards to get my students asking the right questions.  Any thoughts or suggestions?

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#ModBio Workshop Day 11

Agenda:

  1. WB Discussion Cellular Respiration Laboratory
  2. Simulating Cellular Respiration with MolyMods
  3. Exercise 2 – WB & Discuss
  4. What Do Plants Eat?
  5. Simulating Photosynthesis with MolyMods
  6. Do Plants Photosynthesize all the Time?

The whiteboard discussion of our Cellular Respiration Laboratory was fairly straight forward.  I really struggled with this laboratory because I really wasn’t sure my students were confused about where the CO2 comes from.  But than again, I guess I never really asked them.  Eventually we agreed that the living yeast exposed to the air generated more CO2 than the living yeast under the mineral oil.  This might be a good time to then discuss generally how aerobic cellular respiration is more efficient that anaerobic cellular respiration.
Next we Simulated the process of Cellular Respiration with MolyMods.  I really like the MolyMods.  I’ve used the rubber tube bonding type before.  My students sometimes struggle with the 3-D representations of this type.  The MolyMods use a space-filling model instead of a stick-model.  I think this would make more sense to my kids because they have not taken a chemistry course yet.  We started with a glucose molecule and 6 O2 molecules.  We were directed to breakdown the glucose model and build the products of cellular respiration.  We discussed how we measured CO2 production so that was one product, then Angela used the breathing on a mirror analogy to get at water vapor.  Bring from Maine, I’d use the seeing your breathe in the winter route myself.  After building the CO2 and H2O molecules, we created a balanced equation.  We then researched the organelle where cellular respiration take place, drew a labeled diagram and whiteboarded.  This activity would be followed by some direct instruction on the details of cellular respiration as necessary for our own courses.

The model development phase began with an exercise.  In this exercise we created several different representations for the process of cellular respiration.  I really like that the kids would need to provide an equation, a verbal, a graphical, and an energy LOL chart representation for both aerobic and anaerobic cellular respiration.  Next we drew pictorial representations for several levels of complexity; multicellular organism, cellular, molecular.  Yet another multi-prong approach.  Next was a simple compare and contrast for aerobic and anaerobic.  We finished with a storyboard portion for two different environmental conditions; no oxygen and lots of oxygen.  We whiteboarded a selection of answers and discussed.

Next we used the MolyMods again to simulate photosynthesis.  We already had the CO2 and H2O built from the previous simulation of cellular respiration.  We briefly discussed what plants need to make sugar and were on our way.  I think it is cool that the MolyMod bags will be all set up for next year with the glucose and O2 built.  This lead to the question of “Do plants make their food all the time?”.

To answer that question we used the CO2 and O2 probes and spinach leaves in light and dark environments.  I really like the BioChamber 2000.  At my school we’ve used the BioChamber 250, and I don’t find that we get very consistant data because you can only fit a few leaves in 250-mL chamber.  We were able to create a single layer of many leaves in the 2000-mL chamber.  We also used a circular fluorescent light that wrapped around the entire chamber rather than one single light shining down.  Our homework for the evening was to create a visual, diagrammatic  and graphical representation of our results that we will be whiteboarding tomorrow morning.

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#ModBio Workshop Day 10

Agenda:

  1. Teacher Talk:
    1. HW
    2. Article
    3. Unit 3 Teacher Notes
  2. CO2 from where? Food or Oxygen
  3. Cellular Respiration Laboratory

We’ve been taking a shorter lunch all week so that we could leave a little earlier today, hence the short agenda.  Our day started with a discussion of an article we read for homework, Engaging Students in Conducting Socratic Dialogues: Suggestions for Science Teachers.  This was a very interesting article.  It began with a brief discussion about why students struggle with the idea of questioning each other.  As teachers we’ve modeled this strategy for their whole lives.  The short answer is because they have not been expected to question and they have not received guidance about what good questioning looks like.  Students are often viewed as passive recipients of information.  But in Modeling Instruction students are expected to become actively involved in constructing knowledge with each other based on careful observation, data collection and analysis, logical reasoning and most importantly questions.  Next the authors discussed the Rhodes’ typology of questions, a very thorough list of questions divided into eight categories.  This list can be very helpful for leading Socratic dialogues.    The categories of questions are: informational, interpretive, explanatory, procedural, relational, verificational, heuristic, and evaluational.  I like the framework, but I would be hesitant to use the entire list.  Geoff Schmit blogged about the use of posters to help with Socratic questioning.  I think that is a great idea.  I can definitely see some posters in my classroom in a few weeks to help guide my students and myself through this process of Socratic questioning.  The article finished with some additional suggestions to keep students comfortable so they will stay engaged in the Socratic dialogue.  Some of the highlights:

  • allow students to present without interruption
  • show respect for student conclusions
  • maintain a positive atmosphere
  • let the students feel that a new idea is theirs

Next we discussed the teacher notes for Unit 3 – Evolution.  Some members had a list topics that were part of their curriculum.  Angela pointed out that the modeling curriculum is really just a starting point.  If you have other aspects of your curriculum, please add them, but keep the storyline in mind.

The rest of the day was spent introducing and conducting our cellular respiration laboratory.  First we discussed different kinds of waste; feces, urine, and CO2.  Next we brainstormed where the CO2 might come from and came up with the air and food.  We conducted an experiment using Vernier CO2 probes.  We had four different experimental groups:

  1. dead yeast exposed to air
  2. dead yeast under a layer of mineral oil
  3. living yeast exposed to air
  4. living yeast under a layer of mineral oil

Data collection was fairly straight forward with the probes.  We collected data every 15 seconds for 4 minutes.  We analyzed the results and created a whiteboard but did not present until Monday morning.

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#ModBio Workshop Day 9

Agenda:

  1. Group Evolution Model Summary Boards
  2. Homework:
    1. Discuss Exercise 2
    2. Discuss Test
  3. Energy Stations Activity – WB & Discuss
  4. Zoom
  5. A Vital Commodity Activity – WB & Discuss
  6. Exercise 1 – Discuss
  7. What is Food
  8. Energy Organism View

We started the day by collaborating on our group Evolution Model Summary Boards.  Members of both groups commented that the flow of this model was harder to track than previous models.  My guess was because evolution is a more difficult concept to wrap your head around that experimental design or classification.  I personally liked how just about every topic that was brought up could be linked back to the Thirsty Bird Laboratory.  As someone who was not originally sold on the lab, I do see a lot of merit to it, especially if you are following the modeling biology sequence of units.

Next we briefly discussed the exercise and test.  No big revelations in either conversation.  I did find a nice sequence of questions that with a little modification I think I’ll be using this year.  As someone who is not a huge fan of tests, I’ll be working to create some more authentic assessments.

I’ve been waiting to work through the energy stations activity since I read about them last year.  They didn’t disappoint.  It was a series of simple observations about different energy transfers.  At each station we had three questions to answer: summarize the procedure, make observations, and describe the energy storage and transfers.  After completing all the stations, each pair whiteboarded two of the stations.  The ensuing discuss was eventful.  We got into some very specific details about energy and energy transfers.  I can see how this particular portion of the unit can be very different if you are a biology first course or a physics first sequence.  This would be further compounded if the PCB sequence was also a modeling school.  Eventually we settled on energy either being stored (chemical potential, gravitational potential, elastic potential or kinetic), or transfered (radiating, heating, working, or dissipated – heat, sound, sound).  I’m sure I’ll be leaving it much simpler than this with my students, probably just referring to stored or transfered energy.  I do think the idea of dissipation is important because of the inefficient energy transfer between trophic levels.  I’d like my students to get away from saying that ~10% energy is “lost” between trophic levels and instead talk about that energy being transfered to the environment.  The homework for the day with kids would be for them to storyboard one of the experiments  for beginning-middle-end of the activity discussing how energy is stored and transfered.

Next we did a simulation called A Vital Commodity.  In this activity, we took different roles  in an aquatic ecosystem; plankton, shrimp, cod, and dolphin.  In this activity, we used beans to represent energy.  This energy was transfered between organisms through either feeding or interactions.  In a feeding, the prey would give the predator 5 beans and both organisms would add 2 beans to the environment.  Plankton would interact with the energy source to get 10 beans for each interaction.  We progressed with multiple interactions, although you had to interact with everyone before repeating an interaction.  Eventually time was called, slightly late, as two shrimp died.  We totaled up the energy of each organism. Next we whiteboarded the results of the experiment in words, visual, and graphic forms.

The model deployment tool here is Exercise 1 – Energy.  I was not a big fan of the exercise as written.  It would definitely be too complicated for my kids.  I’ll be modifying it in some fairly substantial ways before using it in class.

The rest of the day was “hand waving” as Angela would say.  We quickly discussed introducing the idea of macromolecules through food labels.  This is exactly how I introduce it with my kids.  The homework would be a macromolecule research project.  Assign each kid a group (carbohydrate, lipid, protein) and they need to identify one example from the group, describe the job/function of the molecule and identify the smaller parts that are combined to make the macromolecule.  I think this is a fantastic idea.  It will definitely make this information more student centered.  I dread this portion of the lecture each year, so I’ll be excited to try this out in the fall.

In the modeling curriculum we would next take a trip through comparative anatomy through an earthworm, grasshopper, frog and fetal pig dissections.  Only two of our ten teachers would be presenting this in class, so we skipped it.  We’ll also skip the comparison to plants later on.

A couple thoughts from the day:

Some of the participants mentioned that the evolution unit was difficult for them to follow because they needed more structure.  This brought up a discussion about the interactive science notebooks.  I gleamed a couple great ideas for unit organization:

  1. Reserve the 1st left hand page for the Ahh… Page
  2. Reserve the next left hand page for a vocabulary page, all the definitions go here and are modified as necessary through the unit
  3. Reserve the next left hand page (3rd of the unit) for a model representation page.

I think these additions will help keep my students organized.  I’ve been thinking about the interactive science notebooks for a year or two now.  I’m really liking how it is working in this course.

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#ModBio Workshop Day 7

Agenda:

Parking Lot

AMTA

Thirsty Birds Experiments 4-6

Exercise 1 – Natural Selection

We started off the day by logging into a free one year membership to the American Modeling Teacher’s Association.  I must admit was nice to finally be able to delete my e-mail notification that my membership was expiring.  Those little red circles on the app get on your nerve after a while.

Next we continued our Thirsty Bird Simulation that we started yesterday.  Today we introduced the mutation of a spoon.  We worked through the same three experiments as yesterday; no competition, competition with differential reproduction; and drought.  After running through several generations for each experiment we pooled our data with another class, really Angela just made up some data, because having a bunch of data really helps with this particular simulation.  We whiteboarded our results and discussed. We noticed that the graphed data looked very different from what we had experienced in terms of the percentages of spoons during the drought.  We re-graphed just that experiment with each data set separate.  Eventually we settled on the following conclusions; color and mouth part (fork/spoon) did not matter in the no competition experiment.  In the competition experiment, color did not matter and being a spoon helped, but being a fork was not necessarily harmful.  In the drought situation, color did not matter, being a spoon helped and being a fork was harmful.  Finally we created a storyboard about one of the experiments projecting the results out 100 generations.  I really think that my students will understand the concept of natural selection better by having the three different representations; text, graph, picture, to use to process the results from the laboratory.

Next we were supposed to read an article on genetic drift.  But we were running short on time so it was assigned as homework.

The last part of the day was spent working on Exercise 1 – Natural Selection.  In this exercise we worked individually for 5-10 minutes to look at four different situations; a peppered moth style example, an acquired traits example, an American Chestnut Tree/fungus example, and a bird weight selection example.  After working individually we partnered up and whiteboarded one of the situations.  Unfortunately I must have spaced out because I didn’t get any pictures of those whiteboards.  If anyone from the workshop has any I’d greatly appreciate a copy.

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