Mitosis and Meiosis - Awesome Science Teacher …
NOVA - How Cells Divide (Mitosis VS Meiosis) - PBS
In meiosis, replicated homologous chromosomes pair off during the first division, then these separate from each other, assuring that one member of each pair of chromosomes goes into two separate cells. Replicates separate in the second division. In mitosis, there is no pairing of replicated homologous chromosomes.
LabBench Activity Mitosis and Meiosis
Later in my Repro unit, as part of my intro to sexual reproduction, I introduced Meiosis as primarily a means of preventing the redoubling of chromosomes (following fertilization) for every generation. In addition, meiosis provides ways for increased variation (random assortment, crossing over, and fertilization--from different lines of ancestry: male and female). After introducing meiosis, I developed a lab experience in which they were expected to manipulate pipe-cleaner chromosome models showing key features of mitosis, with every student getting approved for that, then showing key features of meiosis, and getting approved for that. [See my "" lab]. It's a wild lab, with me rushing around the room to check out individual efforts, while students work independently and interactively on showing those distinctive features, a la short, simple set of rules.