lecture_17__2009

lecture_17__2009 - plit Distinguished Alumni Panel 2 pm,...

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Distinguished Alumni Panel 2 pm, Friday, Oct. 16, Newton 204 Come and hear from a variety of successful biology graduates;     find out their keys to success, both at Geneseo and beyond. Refreshments follow.
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Lecture 17, 10-14-09 Chapter 47, Animal Development
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The uterus during a woman’s pregnancy best resembles A. the menstrual phase of the menstrual cycle B. the proliferative phase of the menstrual cycle C. the secretory phase of the menstrual cycle
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Overview: A Body-Building Plan It is difficult to imagine that each of us began life as a single cell, a zygote And according to Lewis Wolpert’s famous quote: “It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life.”
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A human embryo at approximately 6–8 weeks after conception shows the development of distinctive features Figure 47.1 1 mm
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The question of how a zygote becomes an animal has been asked for centuries As recently as the 18th century the prevailing theory was a notion called preformation Preformation is the idea that the egg or sperm contains an embryo A preformed miniature infant, or “ homunculus ,” that simply becomes larger during development Figure 47.2
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An alternative hypothesis Epigenesis : the form of an animal emerges from a relatively formless egg. An organism’s development is primarily determined by the genome ( & cytoplasmic determinants) of the zygote and the organization of the egg’s cytoplasm, in particular, the mRNA and protein contained there. Cell differentiation is the specialization of cells in their structure and function Morphogenesis is the process by which an animal takes shape (differentiated cells’ locations)
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http://www.pbs.org/wgbh/nova/miracle/program_adv.html I would recommend the following site by Nova entitled “ Life’s Greatest Miracle :” In all there are 8 chapters, each a separate video, total play time is about 45 minutes. Try one, you might watch another! This program is rated TV-14, S. Viewer discretion is advised .
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Concept 47.1: After fertilization, embryonic development proceeds through cleavage, gastrulation, and organogenesis Important events regulating development occur during fertilization and each of the three successive stages that build the animal’s body We begin with Fertilization, a series of metabolic reactions within the egg and sperm that trigger the onset of embryonic development
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A. Fertilization The main function of fertilization is to bring the haploid nuclei of sperm and egg together to form a diploid zygote Contact of the sperm with the egg’s surface initiates metabolic reactions within the egg that trigger the onset of embryonic development
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The Acrosomal Reaction (sea urchin) Is triggered when the sperm meets the egg Acrosome Releases hydrolytic enzymes that digest material surrounding the egg Gamete contact and/or fusion depolarizes (the entry of
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lecture_17__2009 - plit Distinguished Alumni Panel 2 pm,...

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