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MCDB 4650 DEVELOPMENTAL BIOLOGY CLASS NOTES Class 1 1 - 1 Introduction to development Reading : Chp 1: 1-13; Chp 2: 25-31, 44-46 Learning goals : Be able to: Give a general description of what development is all about. Define life cycles, stages of embryonic development, determination and differentiation. In this class we will first address all the particulars of how this course works, review a few basic terms and concepts of development that should already be familiar to you from introductory biology and then preview some of the fundamental problems we will be concerned with throughout the semester. Life Cycles Development is the series of changes that take place in an organism during its life cycle. The simplest cycles consist of growth plus mitosis. This is the basic cell cycle: G1, S, G2, and M. The more complex life cycles of some single-celled organisms and all multicellular organisms include two other processes: differentiation and sexual reproduction . Differentiation can be defined as the display of different phenotypes by cells of the same genotype—for example, skin cells and muscle cells in the human body produce different proteins and have different functions. Sexual reproduction involves an alternation of haploid and diploid phases, involving fusion of haploid cells to form diploid cells, which can undergo genetic recombination and give rise to haploid cells with new combinations of genes. Recall the processes involved in a sexual reproductive cycle: fertilization , recombination
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This note was uploaded on 02/25/2010 for the course MCDB 4650 taught by Professor Staff during the Spring '08 term at Colorado.

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