This is a hands-on lesson that models crossing-over, independent assortment, and fertilization in an easy-to-understand manner. By the end of this activity, students were able to explain each concept and how they create genetic variation in populations.
NOTE: For this lesson, you need pop-beads. However, it can easily be edited to use other meiosis cut-outs.
NGSS HS-LS3-1 Ask questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for characteristic traits passed from parents to offspring.
NGSS HS-LS3-2 Make and defend a claim based on evidence that inheritable genetic variations may result from: (1) new genetic combinations through meiosis, (2) viable errors occurring during replication, and/or (3) mutations caused by environmental factors.