Describe the appearance and behaviour of chromosomes during prophase and during anaphase of mitosis.

Prophase

Anaphase

A scientist used an optical microscope to determine the mitotic index in cells at different distances from the tip of onion roots.

Figure 4 shows the results.

Complete the word equation used to determine each mitotic index in Figure 4.

Mitotic Index =

The scientist used data from Figure 4 to calculate a correlation coefficient (r). The scientist then used a statistical test to determine the probability (P) associated with the value of r.

r = –0.98 (P < 0.05)

What can you conclude from this result?

What can you conclude about the effect that distance from the root tip has on the proportion of cells in different stages of the cell cycle?

Use information in Figure 4.