Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings PowerPoint Lectures for Biology: Concepts and Connections, Fifth Edition – Campbell, Reece, Taylor, and Simon Lectures by Chris Romero Chapter 11 The Control of Gene Expression: Differentiation and Stem Cells

Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings

Did YOU know??? Table 11.20

Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings 11.2 Differentiation

Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings Different types of cells Muscle cellPancreas cellsBlood cells Figure 11.2

Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings Therapeutic cloning can produce stem cells with great medical potential CONNECTION Figure 11.12

Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings What’s the difference? Totipotent, pleuripotent, multipotent

 Internationalism: Stem cell research has depended on the work of teams of scientists in many countries, who share results and so speed up the rate of progress. However, ethical concerns about the procedures have led to restrictions on research in some countries. National governments are influenced by local, cultural and religious traditions, which vary greatly, and these, therefore, have an impact on the work of scientists.  TOK: balancing the huge opportunities of therapeutic cloning against the considerable risks—for example, stem cells developing into tumours.