Presentation on theme: "1 Review What happens during differentiation 2 Review What are stem cells Compare and Contrast How are embryonic stem cells and adult stem cells alike."— Presentation transcript:
1 1 Review What happens during differentiation 2 Review What are stem cells Compare and Contrast How are embryonic stem cells and adult stem cells alike and how are they different 3 Form an Opinion How might technological advances help address the ethical concerns surrounding stem cell research
2 Ch 10 Cell Growth and Division 10.4 Cell Differentiation
3 All organisms start life as just one cell Embryo Early stage of development most multicellular organisms pass throughCells become more differentiated and specialized.
4 DifferentiationProcess of cells becoming specialized.
5 Cell’s role can be determined at a specific point in development.
6 Differentiation in Mammals Controlled by a number of interacting factors in the embryoChemical signalsRegulatory factorsInteraction between cellsAdult cells generally can no longer differentiate.
7 Stem Cells Unspecialized cells from which differentiated cells develop TotipotentCan form all the tissues of the bodyOnly the fertilized egg and first few divisions
8 Embryonic Stem Cells Pluripotent Blastocyst Capable of developing into many, but not all, cell typesLocated in inner mass of cells of blastocystBlastocystEarly embryo stage with a hollow ball of cells with a cluster of cells inside
10 Adult Stem Cells Multipotent Can produce many types of differentiated cellsTypically produce only the types of cells that are unique to that tissue where they are located.
11 Potential BenefitsResearch may lead to new ways to repair the cellular damage that results from heart attack, stroke, and spinal cord injuries.
12 Ethical IssuesMost techniques for harvesting, or gathering, embryonic stem cells cause destruction of the embryoGovernment funding vs. private funding.
13 Cellular Differentiation of C. elangans The adult microscopic worm C. elangans contains 959 cells. Copy the data table and then answer the following questions.
14 Calculate Calculate the percentage of the total cell number reprented by each tissue or organ listed including ‘other’.Infer Why does C. elanans make an ideal model for studying cellular differentiationInfer Why would it be more difficult to map the differentiation patterns in a different organisms like a mammal