Lesson 6-7 Gene Transcription and RNA Modification.ppt

Lesson 6-7 Gene Transcription and RNA Modification.ppt -...

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Unformatted text preview: BIO 325 – Genetics Lectures 6 and 7 Gene Transcription and RNA Modification The “Rain-Frogs” The tree frogs sing: and on the young leaves, suddenly a raindrop-pattering. Rogetsu (1666-1751) Gene Transcription and RNA Modification At the molecular level, a gene is a segment of DNA used to make a functional product – either an RNA or a polypeptide; transcription is the first step in gene expression. Gene Transcription and RNA Modification At the molecular level, a gene is a segment of DNA used to make a functional product – either an RNA or a polypeptide; transcription is the first step in gene expression. Transcription refers to the copying of a DNA sequence into an RNA sequence. Gene Transcription and RNA Modification At the molecular level, a gene is a segment of DNA used to make a functional product – either an RNA or a polypeptide; transcription is the first step in gene expression. Transcription refers to the copying of a DNA sequence into an RNA sequence. Structural genes encode the amino acid sequence of a polypeptide; transcription of a structural gene produces messenger RNA (mRNA). The mRNA sequence determines the amino acid sequence in the polypeptide, which determines the function of the polypeptide; the function of the protein determines traits. Gene Transcription and RNA Modification The mRNA sequence determines the amino acid sequence in the polypeptide, which determines the function of the polypeptide; the function of the protein determines traits. The path from gene to trait is called the central dogma of genetics. Gene Transcription and RNA Modification The Central Dogma of Genetics Overview of Transcription Gene expression is the overall process by which the information within a gene is used to produce a functional product that can determine a trait in play with the environment. Overview of Transcription Gene expression is the overall process by which the information within a gene is used to produce a functional product that can determine a trait in play with the environment. A key concept is that DNA base sequences define the beginning and end of a gene and regulate the level of RNA synthesis. Overview of Transcription Gene expression requires base sequences that perform different functional roles. Overview of Transcription Gene expression requires base sequences that perform different functional roles. For example, the promoter provides a site to begin transcription, and the terminator specifies the end of transcription. Overview of Transcription Gene expression requires base sequences that perform different functional roles. For example, the promoter provides a site to begin transcription, and the terminator specifies the end of transcription....
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This note was uploaded on 02/27/2011 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas.

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Lesson 6-7 Gene Transcription and RNA Modification.ppt -...

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