2 lecture ZOO NEW

2 lecture ZOO NEW - What is this class about THE ISSUE...

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What is this class about? Who was the first recorded embryologist? Name one contemporary Developmental Biologist and what they are famous for. What are embryonic stem cells? How do cells know what to become? How are embryos different from the assembly of machines? THE ISSUE: ABOUT BECOMING NOT BEING Initiation and construction of an organism (not maintenance)
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Some definitions Zygote – the fertilized egg; union of sperm and egg to form diploid cell; beginning of new organims Development – morphological, biochemical and physiological differentiation of an individual, 2 functions Production and organization of diverse cell types Reproduction, generation of new individuals Differentiation – generation of cellular diversity Morphogenesis – creation of form and structure Growth – increase in size Embryology -study of embryo till time of parturition Ontogeny – development of individual from fertilization to death
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Representative Cell types blastula goes through gastrulation Fig. 1.1
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Six General Questions Form Basis of Studies 1. How do we generate cellular diversity, (genetic constancy)? Same cells, at least DNA content, are identical. These cells are still very different in structure 2. How are differentiated cells distributed (morphogenesis)? 3. How is cell division regulated? Cells must know when to stop dividing 4. How are cells set apart to form the next generation? 5. How do changes in development create new body forms? evolution as a function of survival 6. How is process of development integrated with context of an organisms habitat? environmental influences, metamorphosis
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How do we study embryos? Anatomical – how do they change structure
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This note was uploaded on 07/22/2011 for the course BIOL 3156 taught by Professor Lynn,j during the Spring '08 term at LSU.

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2 lecture ZOO NEW - What is this class about THE ISSUE...

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