Passage I
The mitotic index (MI) for a group of cells is calculated as follows:
MI = 
Figure 1 shows the average MI for onion root tip cells as a function of their distance from the root cap.
Five hundred mitotic onion root tip cells were examined. Figure 2 shows the number of cells in each of the 4 mitotic phases.
Figure 3 shows 4 onion root tip cells (Cells 1-4), each of. which is in 1 of the 4 mitotic phases. In Figure 3, each phase is shown once. However, the cells are not arranged in order of the phases of mitosis.
Figure 3 adapted from Peter H. Raven, Ray F. Evert, and Susan E. Eichhorn, Biology of Plants, 4th ed. @1986 by Worth Publishers, Inc.
1. According to Figure 2, how did the number of onion root tip cells in telophase compare with the number of onion root tip cells in metaphase? The number in telophase was about:
Your Answer is
Correct Answer is D
Explanation
Looking at figure 2, the number of cells corresponding to the telophase is about 125, and the corresponding metaphase is about 25, so the telophase is 5 times that of the metaphase