
Concept explainers
Body, Heal Thyself
The precision of mitotic cell division is essential for repairing damaged tissues like those in Bartolo Colón’s pitching arm. Imagine what might happen if DNA synthesis during interphase did not copy all of the genes accurately, or if mitotic cell division sent random numbers and types of chromosomes into the daughter cells. Some of the daughter cells might not contain all the genes needed to form the cell types that are required to repair damaged tissues. Other daughter cells might have genetic changes that stimulate unrestrained cell division and cause cancer. In cancer cells, the cell cycle spins out of control, but under normal circumstances cell division is precisely regulated. How does the body usually control the cell cycle?

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Chapter 9 Solutions
Biology
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