# Lab 11

Topics: Cell cycle, Mitosis, Cell nucleus Pages: 2 (331 words) Published: April 19, 2015
﻿Lab 11: Mitosis
Mitosis is a part of the cell cycle process by which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus. Mitosis has several phases during the cell cycle. The experiment obligated pictures of onion root tips under the microscope. The pictures had cells and chromosomes. The pictures also had different phases of mitosis in them. As my hypothesis, cells stay in the interphase the longest. To begin the experiment, there were pictures of the microscopic cells of an onion root tip. There are four images, each displaying a different view. First I needed to pick one of the images, count the number of cells in each stage. And then count the number of cells in the whole image. After this I conducted the percentage of each stage. The formula to get this was 24(number of cells in stage)/number of cells in image. In my results, I found that the cells did spend the most time in interphase. The image I chose had 30 cells. Interphase stage had 19, prophase had 7, and the rest of the stages only had 1. The percentage of interphase was 15.2% and prophase was 5.2%, while the rest of the stages were only 0.8%. Table 2: Mitosis Data

Number of Cells in Each Stage
Total Number of Cells
Calculated % of Time Spent in Each Stage
Interphase: 19
30
Interphase:15.2
Prophase: 7

Prophase: 5.6
Metaphase:1

Metaphase:0.8
Anaphase:1

Anaphase:0.8
Telophase:1

Telophase:0.8
Cytokinesis:1

Cytokinesis:0.8

After I calculated the times in each stage I took drawings of each stage. I drew each stage and labeled them as followed:

Table 3: Stage Drawings
Cell Stage:
Drawing:
Interphase:

Prophase:

Metaphase:

Anaphase:

Telophase:

In this lab, a lesson about mitosis has been learned. Mitosis is the division of cells and without mitosis we could simply not live. Each phase has a different job in taking part of the cell division.