Lecture 36 - BIOL104-04 Principles of Biology I December 1,...

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BIOL104-04 Principles of Biology I December 1, 2010 Lecture #36 Ch 19 Cellular Mechanisms of Development Ch 19.1 - 19.4 Figure 19.20
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The Process of Development – Zygote undergoes cell division – Some cells die by apoptosis • Differentiation – Differences in gene expression result in cell specialization • Cell movement • Cell-cell interactions – Signals from other cells cause cell division, differentiation & movement
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The process of development – Pattern formation • Cells become oriented to a body plan – Morphogenesis • Organs & anatomical features develop
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Cell division • Cleavage • Stage of rapid cell division after fertilization • Zygote is divided into larger number of smaller cells (blastomeres) • No increase in the overall size of the embryo
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Cleavage in a frog embryo
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every division during cleavage?
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Lecture 36 - BIOL104-04 Principles of Biology I December 1,...

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