Lab 7: Mitosis & Meiosis

Objectives:

Describe the events in the cell cycle and how these events are controlled.
Explain how DNA is transmitted to the next generation via mitosis.
Explain how DNA is transmitted to the next generation via meiosis followed by fertilization.
Understand how meiosis and crossing over leads to increased genetic diversity, which is necessary for evolution.

Make sure you answer the questions for each section of the lab (if called for).
Everything will be in the lab notebook. DO NOT WRITE ON A SEPARATE SHEET OF PAPER.
This lab will be broken down into 2 parts. It is also an INDIVIDUAL lab!
We will be collecting class data for part 2. Please enter in your data so your fellow classmates can complete their lab as well.
For parts 1 & 4, you will not draw them in your notebook but show me each step as you complete it in class.

Prepare an onion root tip slide.
Count cell at high magnification. Use well stained cells. Count those in view at each phase. Repeat in 2 other root tips.
Collect the class data for each group and calculate the mean & standard deviation for each group.
Compare the number of cells from each group.
Collect class data & enter into a table. These are the observed values.
Use the data to calculate the totals with the formulas in the manual.
Use the totals from above to calculate the expected values using formula in manual.
Enter the observed values & expected values in table 4. Calculate the chi-square value.
Compare chi-square to critical value.

Using pop-beads or chalk, illustrate the stages of interphase, meiosis I & meiosis II.
Answer questions along the way as given.