Cell Development and Differentiation (Cell Fate)

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Cell Development and Differentiation (Cell Fate)
Do all cells in one organism have identical
DNA? What determines whether a cell will become
one tissue or another? How does a fertilized
egg know what to do to make an organism?
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Cell fate depends on signals
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How can we tell what is happening with cells in a
developing organism?
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What can be said about the expression of
mitochondrial, ribosomal, and cytoskeletal/neural
genes?
Eembryogenesis Llarval Ppupal A adult
Mmale Ffemale
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An Example of Gradient and Relay Signaling in C.
Elegans
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Plant Development

1. Plants do not gastrulate.
2. Germ cells are not set aside early in
   development.
3. Plants undergo extended morphogenesis.
4. Plants have tremendous developmental plasticity.
   Plants may tolerate higher genetic loads than
   animals.

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Homeotic genes
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Some Processes in Development are Common Across
All Organisms
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http//www.med.unc.edu/embryo_images/unit-welcome/
welcome_htms/contents.htm
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http//bidmc.harvard.edu/display.asp?node_id2791