If you’re following this scope and sequence, then you’ve finished unit 6 (I do unit 6 before unit 5). That sets you up to start unit 5, Heredity. As the College Board suggests, I start with Meiosis (Topics 5.1 and 5.2) but then jump to Topic 5.6 (Chromosomal Inheritance). Next week, we’ll jump back to Mendelian and post-Mendelian genetics, which comes in between. Show
Stitching that all together, here are the College Board’s learning objectives for this unit, reframed in a student and teacher friendly format.
If you have your students complete our module about Meiosis on Learn-Biology.com, you can ensure that your students will master all of these objectives. Your students can use this Meiosis Student Learning Guide to guide them through the materials. Note that you can also used this student learning guide as a review sheet and for checking for understanding. Here’s an overview of what’s in the tutorials. 1. Meiosis: Basic ConceptsThis tutorial will teach your students the difference between haploid and diploid cells, and the meaning of the term homologous in the context of meiosis and chromosomes. 2. Meiosis 1 v. Meiosis 2In this tutorial, your students will come to understand how meiosis, fertilization, and mitosis fit into the life cycle of sexually reproducing organisms, like us. This is captured in the diagram below. Students will also learn to distinguish between meiosis 1 and meiosis 2, and to be able to compare and contrast mitosis and meiosis, as shown in this diagram. 3. How Meiosis Creates VariationOur third tutorial focuses on the two key processes by which meiosis creates variation: independent assortment of chromosomes, and crossing over, which creates newly recombinant chromosomes in every generation. By the end of this tutorial, your students will be able to talk, write and think their way through diagrams like this: 4. Sex Determination, Nondisjunction, and Human Chromosomal VariationMeiosis explains some of the basic facts of life: like why births are approximately 50/50 male and female. This last tutorial takes on that topic, and also looks at nondisjunction and its consequences: Down Syndrome, Klinefelter Syndrome, XYY, and Turner Syndrome. Other resources:My Meiosis Song can help you teach a surprising amount of the material above. Here’s how it starts: Meiosis is how make sex cells or gametes, The sperm cells or egg cells performing the feat, Of moving genes forward in eukaryotes like orchids and bees, Meiosis doesn’t happen in all cells of the body, The video (linked above) is great for review, or even for a preview. You can show it at the start of the unit, accompanied by some big picture questions like:
For a group activity, there’s a Meiosis POGIL, but it’s not in the AP set of POGILS: it’s in the high school set. You can buy POGILS from Flinn Scientific. Note that this is the only one from the high school set that I use, so you have to decide if it’s worth the investment (the AP Bio ones definitely are). In terms of labs, the one that’s recommended by the College board is the Sordaria lab. (the link goes to the College Board’s AP Bio lab manual). To understand the underlying biology (which can be fairly tricky and often misunderstood), please look at this page on my website. Depending on how comfortable you are working with fungi, you can breed the various strains together yourself, or you can buy pre-inoculated plates from companies like Carolina or Flinn. An even easier route is to just buy Sordaria cards, which are sold by Flinn. Week 22 and 23: Heredity (Topic 5.3 – 5.5)It takes me about two weeks to teach genetics. Note that my previous meiosis unit includes topics like nondisjunction, so I’m talking about two weeks to cover standards 5.3, 5.4, and 5.5. Add to that the one week it takes to teach meiosis, and you should be able to get through all of Unit 5 in about 3 weeks. Here’s a link to the College Board’s learning objectives for all of Unit 5. Note that “EU” is an enduring understanding, “LO” is a learning objective, “IST” is information storage and transfer,” and “SYI” is systems interactions. Scroll down a bit from the link and you’ll be at topic 5.3, Mendelian Genetics. The CB’s objectives are expansive, so here’s an abbreviated list.
Genetics tutorials on Learn-Biology.comLearn-biology.com organizes online learning about genetics into six tutorials. Mendelian Genetics and Punnett SquaresUsing the example of sickle cell anemia, this introductory tutorial will teach basic genetics vocabulary (dominant, recessive, phenotype, genotype, etc). It also walks your students through how to solve genetics problems using Punnett squares. Solving ABO Blood Type inheritance problemsIn this tutorial, I introduce the idea of codominance and multiple alleles. This topic is not explicitly in the standards, but how can you not teach about blood type? Solving Genetic Problems involving sex linked allelesThis tutorial teaches about sex-linkage, focusing on hemophilia. Dihybrid CrossesAfter doing this tutorial, your students will know how to set up and solve dihybrid crosses. Linkage and RecombinationLinked genes and determining recombination frequencies. Along the way, your student will get a deep understanding of how linkage is different from independent assortment. How to do the χ2 (Chi Squared) TestA step by step walk through everything your students need to understand in order to do chi square analysis of results from genetic crosses. Mitochondrial Inheritance, Incomplete Dominance, and Genotype-Environment InteractionAll of the topics above Teaching genetics in the classroomThere are a lot of breeding simulations, but I don’t use them. The way to get to mastery on genetics is for students to solve LOTS of genetics problems, and that’s my main focus. As students solve these problems, I encourage them to use these six steps for solving genetics problems (which are modeled in the tutorials).
As students get better at solving problems, they can back off on some of these steps (and some would be ridiculously redundant and time-consuming in certain situations, like dihybrid crosses). Here’s what I use.
Resources for Unit 5 ReviewLearn-Biology.com has three sets of resources for review. In addition, use the College Board’s resources on AP Classroom, particularly their progress check questions. Links |