Every minute of the day, your body produces about 300 million new cells by this

ID: 63783 • Letter: E

Question

Every minute of the day, your body produces about 300 million new cells by this process – WOW!! You can view an animation of the cell cycle atwww.biology.arizona.edu Follow the links to "cell biology", "cell cycle and mitosis tutorial".

Now that you have a good understanding of mitosis, work through the "onion root tips activity" at the same web site and complete the table below [10 pts]

Interphase Prophase Metaphase Anaphase Telophase Total # of cells 36 % of cells 100% Time spent in each phase

Explanation / Answer

Mitosis is usually divided into four stages, prophase, metaphase, anaphase, and telophase. During mitosis, the division of nuclear material starts with the doubling of chromosomes, followed by distribution between two daughter nuclei in equal proportion. This total process occurs within 30 minutes only. Most of the time is spent in interphase. The below observations belond to mitosis in onion root tip.

Interphase

Prophase

Metaphase

Anaphase

Telophase

Total

No. of cells

% of cells

101% of cells

Time spent in each phase

55.5%

27.8%

8.3%

5.6%

2.8%

100%