BIO 115 development f07 - VII. Development &...

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A. General characteristics - Development is a very sequential event - Begins with coitus B. Human sexual response 4 Stages:
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C. Stages of development 1. Fertilization ~ 200 millions sperm in vagina ~ 2 million through cervix ~ 200 reach oocyte
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Fig. 29.01a
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Fig. 29.01b
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Fig. 29.01c
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- Fusion of cell membranes - Egg only fertile for 24 hrs. 2. Cleavage (Week 1) Mitotic division of cells
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Fig. 29.02
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Fig. 29.03
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3. Bilaminar disc formation (Week 2) - Implanation occurs - Creates 2 layers & cavities - Aminotic & yolk
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Fig. 29.04
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Fig. 29.05
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Fig. 29.06a
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Fig. 29.06b
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3. Bilaminar disc formation (Week 2) - Implanation occurs - Creates 2 layers & cavities - 4. Gastrulation (Week 3) - Creation of 3 germ layers a. Ectoderm
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4. Gastrulation (Week 3) - Creation of 3 germ layers a. Ectoderm - Creates structures most superficial Ex.: Epithelium, nervous & endocrine b. Mesoderm
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Ex.: Epithelium, nervous & endocrine b. Mesoderm - Creates structures found in the middle Ex.: Muscle, bone, epithelium covering of organs c. Endoderm
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Ex.: Muscle, bone, epithelium of organs c. Endoderm - Creates structures most deep Ex.: Organs, epithelial lining
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BIO 115 development f07 - VII. Development &...

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