Mitosis Investigation

AP Biology

This report needs:1.Title2.Null Hypothesis3.Figure 14.Tables 1, 2, 35.Conclusion

Null Hypothesis If mitosis is 10% of the cell cycle, then 10% of the observed cells will be in one of the stages of mitosis.

ResultsInterphase (G1,

S, G2)

prophase

prometaphase

metaphase

anaphase

telophase

Sketch an accurate image for each boxFigure 1. Allium

root tips in the different stages of the cell cycle.

ResultsInterphase Prophase Pro-

metaphase

Metaphase

Anaphase Telophase

Root Tip one

Root Tip two

Root Tip three

Total for all 3 Root Tips

Table 1. Number of cells in each phase

ResultsInterphase Prophase Prometaphas

eMetaphase Anaphase Telophase

Total Cells

Total Mitosis:

Table 2. Class Data for Cells

Results

Group Observed (o)

Expected (e)

(o-e) (o-e)2 (o-e)2________ e

InterphaseMitosis Ʃ

df = 1 p = 0.05

Table 3. Chi-square analysis of Allium root tip cells

Critical value 3.84

Discussion/ ConclusionWhat happened?

How many cells in mitosis? How many cells did we EXPECT to have in mitosis?

Why? Why does this part of the plant have a lot of cells in mitosis or why did this tissue sample match our expected data?

Do we accept or reject the null hypothesis? Why? Explain what the Chi-square test tells us.