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Lecture_1_posted - Biology 303 Introductory evelopmental...

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Biology 303 Introductory Developmental Biology and Embryology
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The Questions of Developmental Biology The Development of multicellular organisms begins with one cell-the fertilized egg or zygote . Development accomplishes two major objectives; 1) it generates cellular diversity and order within each generation. 2) it ensures the continuity of life from one generation to the next.
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The Questions of Developmental Biology The Development of multicellular organisms begins with one cell-the fertilized egg or zygote . Development accomplishes two major objectives; 1) it generates cellular diversity and order within each generation. 2) it ensures the continuity of life from one generation to the next. How does the fertilized egg give rise to the adult body, and how does that adult body produce yet another body?
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The Questions of Developmental Biology The Question of Differentiation How can an identical set of genetic instructions produce different types of cells? The generation of cellular diversity is called differentiation. Figure 1.1
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The Questions of Developmental Biology The Question of Morphogenesis Our differentiated cells are not randomly distributed. The creation of ordered form is called morphogenesis. Figure 3.23
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The Questions of Developmental Biology The Question of Growth Think about what would happen if each cell in your face were to undergo just one more round of cell division? How is cell division so tightly regulated?
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The Questions of Developmental Biology The Question of Reproduction Once we get this highly specialized organism, we have to reproduce it again. ..and again. .. What is it about the sperm and egg that allow them to be the only two cells capable of fertilization?
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The Questions of Developmental Biology The Question of Evolution Evolution involves inherited changes in development. How do changes in development create new body forms and which heritable changes are possible?
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The Questions of Developmental Biology The Question of Environmental Integration The development of all organisms is dependent upon cues from the environment. How is the development of an organism integrated into the larger context of its habitat?
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Fertilization: Beginning A New Organism Chapter 7: pages 176-209
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Fertilization Accomplishes two separate ends: sex and reproduction . Four major events in the process of fertilization: 1. Contact and recognition 2. Regulation of sperm entry into the egg 3. Fusion of genetic material 4. Activation of egg metabolism to start development The egg activates sperm, the reciprocal action is also required. Required for fertilization and initiating development.
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Fertilization Modifcation oF a Germ Cell to ±orm a Mammalian Sperm
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Fertilization Modifcation oF a Germ Cell to ±orm a Mammalian Sperm
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Fertilization Modifcation oF a Germ Cell to ±orm a Mammalian Sperm
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Fertilization Modifcation oF a Germ Cell to ±orm a Mammalian Sperm
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Fertilization The Motile Apparatus of the Sperm
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Fertilization Reproduction in the Sea Urchin One of Hertwig’s
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This note was uploaded on 07/15/2010 for the course BIOL 301 taught by Professor Pickard during the Fall '09 term at Waterloo.

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Lecture_1_posted - Biology 303 Introductory evelopmental...

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