Mitosis and Meiosis Lab Worksheet Assignment Name Vivy Vu Section Lab 7 Date October 20, 2009 Mitosis 1. 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 __________________ 1 pt Number of cells in metaphase_________________1 __________________ 1 pt Number of cells in anaphase__________________0 _________________ 1 pt Number of cells in telophase__________________3 __________________ 1 pt 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 __ ___________________ 2 pts 2. 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 undergoing mitosis. Record the data in Table 1 and compute the percentage of dividing cells. The average of these five fields of view will give a close approximation of the mitotic index for an onion root tip. Table 1 Onion Root Mitotic Index 5 pts Field of views Area 1 Area 2 Area 3 Area 4 Area 5 Average Total # of Cells 50 50 50 50 50 50 # of Cells In Mitosis 12 14 20 19 16 16.2 Percentage of Cells in Mitosis 24% 28% 40% 38% 32% 32.4% 49
Meiosis 3. How many chromosomes does a male grasshopper somatic cell have? 1 pt 23 chromosomes
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