ch._15

ch._15 - Ch. 15 Control over Genes The nature of...

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Ch. 15 Control over Genes The nature of development in a multicellular organism is based upon ____. o Which genes are active in a given cell o When the genes function o The amount of gene products generated Gene Control o Which genes are expressed in a cell depends upon: Type of cell Internal chemical conditions External signals Built-in control systems Mechanisms of Gene Control o Controls related to transcription o Transcription-processing controls o Controls over translation o Post-translation controls Regulatory Proteins o Can exert control over gene expression through interactions with: DNA (transcriptional control) RNA (transcript processing; translational controls) New polypeptide chains (post-translation) Final proteins (post-translation) Homeotic Genes o Occur in all eukaryotes o Master genes that control development of body parts o Encode homeodomains (regulatory proteins) o Homeobox sequence can bind to promoters and enhancers Transcriptional Control Mechanisms o Negative control Regulatory proteins slow down or curtail gene activity
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This note was uploaded on 04/25/2008 for the course V 011 taught by Professor Staff during the Spring '06 term at NYU.

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ch._15 - Ch. 15 Control over Genes The nature of...

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