Biology Chapter 21 Objectives

Biology Chapter 21 Objectives - Chapter 21 The Genetic...

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Chapter 21 The Genetic Basis of Development From Single Cell to Multicellular Organism 1. The fruit fly, nematode, mouse, and zebrafish are used as models for developmental biology research. Fruit flies are small, easily grown, and have a generation time of only two weeks. It produces many offspring and he embryos develop outside the mother’s body – both assets for developmental studies. 2. Morphogenesis in plants and in animals has different patterns. In animals, movements of cells and tissues are necessary to transform the early embryo into the characteristic three-dimensional form of the organism. In plants, morphogenesis and growth in overall size are not limited to embryonic and juvenile periods but occur throughout the life of the plant. Differential Gene Expression 3. Genomic equivalence was determined for plants and animals through cloning. 4. During differentiation, changes occur, as some areas of the genome are nontranscribable. 5. The ewe Dolly and the first mice were cloned using nuclear transplantation. The nucleus is removed from an unfertilized egg cell or zygote, and then replaced with the nucleus of a differentiated cell. If the nucleus from the differentiated donor cell retains its full genetic capability, then it should be able to direct development of the recipient egg into all the proper tissues and organs of an organism. 6.
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This note was uploaded on 08/29/2009 for the course BIOL 101 taught by Professor Sakji during the Fall '08 term at Linn Tech.

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Biology Chapter 21 Objectives - Chapter 21 The Genetic...

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