Lesson 3: Mitosis
What We're Going to Learn and Why it Matters
Observe
On the projection you will see an image of a very thin section of the growing tip of an onion root. (Discuss the invention of new stains that allowed the nuclear material to show up really well in sildes like these.)
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Predict
- What patters do you observe?
- What significance might this pattern have?
Small Group Discussion
- Develop a model that explains the differences between the cells in an onion root tip. Include both the cells with typical and atypical nuclei.
- Then draw a labeled diagram to represent your model. It should
- show a logical sequence of cell drawings
- describe the main events taking place
- discuss the possible significance of what you’ve observed
Full Group Consensus Discussion
- Can we place them in a logical sequence?
- What exactly are chromosomes and what role do they play in mitosis?
- If time: What can we suggest about the duration of these stages?
Individual Summary
Homework:
- Read the attachment on Google classroom about the discovery that DNA is the genetic principle. Then add to your model using reading on mitosis to answer the question: How does this relate to the principles of inheritance that we’ve looked at in Mendel’s work?
- Ch 10 Assessment Qs #29-35 (see attachment on Google Classroom)