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Bellwork

Bellwork. Put these terms in order from earliest stage to latest stage: a dult juvenile embryo zygote fetus How are the cells that divide early on (right after sperm meets egg) different than most of the cells in your juvenile body?

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Bellwork

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  1. Bellwork • Put these terms in order from earliest stage to latest stage: adult juvenile embryo zygote fetus • How are the cells that divide early on (right after sperm meets egg) different than most of the cells in your juvenile body? 3. What eight letters correspond to the levels of organization in a complex multicellular being like humans? 4. Cells are different (they differentiate) based on what genes are expressed. What is produced from those genes that makes each cell different (the product of gene expression)? 5. Read the section in your book packet about stem cells p 20.

  2. The genes that aren’t expressed are more tightly coiled than the genes that are expressed. Heterochromatin, the more tightly coiled DNA, appears darker under an electron microscope than euchromatin, the loosely coiled DNA. More on coiling and transcription in 3.3 and 3.5

  3. 2.1.9 Stem cells retain the capacity to divide AND have the ability to differentiate along different pathways

  4. Two things set stem cells apart from ‘regular cells’ Self-renewal: the ability to go through numerous cycles of cell division while maintaining the undifferentiated state. 2) Potency: Stem cells are undifferentiated and have the capacity to differentiate down different paths into specialized cell types. This requires stem cells to be eithertotipotentorpluripotent to be able to give rise to any mature cell type

  5. aka multipotent

  6. any most some

  7. totipotent any pluripotent most multipotent some

  8. http://learn.genetics.utah.edu/content/stemcells/scintro/ http://learn.genetics.utah.edu/content/stemcells/sctypes/

  9. 2.1.10 Outline one therapeutic use of stem cells.

  10. 2.1.10 Outline one therapeutic use of stem cells. Your assignment: Research one therapeutic use of stem cells. Answer these questions: Who is doing this research? When was this research done? How are the scientists using the stem cells?  Include detailed description. DUE THURSDAY! (no late work will be accepted)

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