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Germ layer

Ap Biology Chapter 47 Review

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Chapter 47: Animal Development Overview ?It is difficult to imagine that each of us began life as a single cell called a zygote ?A human embryo at about 6?8 weeks after conception shows development of distinctive features 1. An organism?s development is controlled by the genome of the zygote as well as by molecules from the mother that are in the cytoplasm of the egg. What are these proteins and RNAs called? ?Development is determined by the zygote?s genome and molecules in the egg called cytoplasmic determinants 2. What is cell differentiation? ?Cell differentiation is the specialization of cells 3. How do cytoplasmic determinants affect cell differentiation? ?Structure and function 4. What is morphogenesis? ?Morphogenesis is the process by which an animal takes shape

AP Bio Reading Guide Answers CH 47

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Copyright ? 2011 Pearson Education, Inc. - 1 - Name _______________________ Period ___________ Chapter 47: Animal Development Overview 1. Before beginning this chapter let?s review the basic embryological stages common across a range of animal species. The basic embryological plan is zygote ? cleavage ? blastula ? gastrula ? organogenesis. Explain what each term means and how one stage leads to the next. Zygote: The product of a sperm and an egg fusing (i.e., fertilization) Cleavage: When a series of cell divisions divide or cleave the zygote into a many-celled embryo; typically rapid and lack accompanying cell growth, converting the embryo to a blastula Blastula: A hollow ball of cells that marks the end of the cleavage stage of an early embryo
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