Mitosis and Meiosis Lab Worksheet Assignment
October 20, 2009
Use your root tip slide to count 50 dividing cells. Tabulate the numbers of those 50
cells that are in each stage of mitosis (prophase, metaphase, anaphase, and
telophase). Record the data below.
Number of cells in prophase__________________46
Number of cells in metaphase_________________1
Number of cells in anaphase__________________0
Number of cells in telophase__________________3
Based on this data, what conclusions would you draw as to the length of time a cell
spends in each of these respective stages?
It spends a lot of time in prophase
Select, at random, five separate areas in the zone of multiplication. In each area,
count about 50 cells in the field of view, and record how many of those cells are
Record the data in Table 1 and compute the percentage of dividing
The average of these five fields of view will give a close approximation of the
mitotic index for an onion root tip.
Onion Root Mitotic Index
Field of views
Total # of Cells
# of Cells
of Cells in
How many chromosomes does a male grasshopper somatic cell have?
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