Essay 23 - Gene Expression

Essay 23 - Gene Expression - Essay 23: An entire organism...

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Essay 23: An entire organism develops from a single fertilized egg that contains one complete genome. Write an essay in which you propose mechanisms involving gene expression by which cells expressing different structures and functions, such as lymphocytes, muscle, nerve, and liver, are derived from a single egg cell. Complete this essay by providing examples of such processes in the development of Drosophila . Transcription factors control gene expression Differential distribution of molecules from the egg cytoplasm and differential distribution of transcription factors Development of Drosophila: o Pattern formation dictated by cytoplasmic determinants and inductive o Maternal effect gene that when mutant in mother results in mutant phenotype in offspring Egg-polarity genes One group sets up anterior posterior axis Drosophila: Nurse cells secrete mRNA for a transcription factor termed bicoid (meaning two tailed) Bicoid is a morphogen that directs the formation of the
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This note was uploaded on 02/09/2012 for the course BIOL 104 taught by Professor Smith during the Spring '09 term at Arkansas State.

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Essay 23 - Gene Expression - Essay 23: An entire organism...

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