Cellular Reproduction: Cells from Cells - LTCC Online
[Pages:100]Chapter 8
Cellular Reproduction: Cells from Cells
PowerPoint? Lectures for
Campbell Essential Biology, Fifth Edition, and Campbell Essential Biology with Physiology, Fourth Edition
? Eric J. Simon, Jean L. Dickey, and Jane B. Reece
Lectures by Edward J. Zalisko
? 2013 Pearson Education, Inc.
Biology and Society: Virgin Birth of a Dragon
? In 2002, zookeepers at the Chester Zoo were surprised to discover that their Komodo Dragon laid eggs.
? The female dragon had not been in the company of a male.
? The eggs developed without fertilization, in a process called parthenogenesis.
? DNA analysis confirmed that her offspring had genes only from her.
? 2013 Pearson Education, Inc.
Biology and Society: Virgin Birth of a Dragon
? A second European Komodo dragon is now known to have reproduced
? asexually, via parthenogenesis, and ? sexually.
? 2013 Pearson Education, Inc.
Figure 8.0
WHAT CELL REPRODUCTION ACCOMPLISHES
? Reproduction
? may result in the birth of new organisms but ? more commonly involves the production of new
cells.
? When a cell undergoes reproduction, or cell division, two "daughter" cells are produced that are genetically identical
? to each other and ? to the "parent" cell.
? 2013 Pearson Education, Inc.
WHAT CELL REPRODUCTION ACCOMPLISHES
? Before a parent cell splits into two, it duplicates its chromosomes, the structures that contain most of the cell's DNA.
? During cell division, each daughter cell receives one identical set of chromosomes from the lone, original parent cell.
? 2013 Pearson Education, Inc.
WHAT CELL REPRODUCTION ACCOMPLISHES
? Cell division plays important roles in the lives of organisms.
? Cell division
? replaces damaged or lost cells, ? permits growth, and ? allows for reproduction.
? 2013 Pearson Education, Inc.
Figure 8.1a
FUNCTIONS OF CELL DIVISION
Cell Replacement
Growth via Cell Division
LM Colorized SEM
Human kidney cell
Early human embryo
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