These two lessons help students to understand the sources of variation in meiosis (independent assortment and crossing over) in detail. For both lessons, concepts are reinforced visually and mathematically.
Students begin by contrasting mitosis and meiosis, and then reviewing the concepts of homologous chromosomes, diploid cells, and haploid cells. Students are then asked to rate their comfort with these concepts before they move on. If they are comfortable, they then draw pictures of tetrads to make sure that they understand this new vocabulary word. They watch a short (less than 2 minutes) video on their I-phone and explain independent assortment in their own words.
The main activity of the lesson asks them to make sperm inside of a fruit fly. They decide which trait goes into which sperm cell by flipping a coin. Finally, they practice determining how much variation can be produced by independent assortment alone, and illustrate their understanding of independent assortment by coloring chromosomes in various arrangements.
Lesson Two- (Note: this lesson takes my students 2 days.)
Students begin by examining a picture of and video about crossing over, then describing it in their own words. Next, they color code chromosomes based on whether they are maternal or paternal.
As in lesson one, the main activity of the lesson asks them to make sperm inside of a fruit fly. This time, crossing over and independent assortment are BOTH represented in the simulation. Students flip coins to sort chromosomes, then flip them again to determine if the sister chromatids cross over or not, as well as where the crossing over occurs. Once this is determined by chance, they complete meiosis with their own unique cell. Finally, they answer analysis questions related to the activity and perform a concept check in.
Some portions of this packet are not my original work. These portions have been included in the free preview document in their entirety.
These lessons have made a major difference for my students' understanding of meiosis. (NOTE: this lesson is part of a series. Companion lessons may be found below.
Introduction to mitosis: https://www.teacherspayteachers.com/Product/Addressing-Misconceptions-in-Mitosis-5136129
Introduction to meiosis: https://www.teacherspayteachers.com/Product/Addressing-Misconceptions-in-Meiosis-5148179)
Reading Karyotypes: Understanding What Happens when Meiosis Occurs Incorrectly:
To purchase the full series at a discounted price, check out this bundled product: https://www.teacherspayteachers.com/Product/Bundled-Lessons-Entire-Cell-Division-Series-5169856
Thank you, and happy teaching!