Introduction to Genetic Analysis 605

Introduction to Genetic Analysis 605 - 44200_18_p575-610...

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604 Chapter 18 The Genetic Basis of Development various flower-identity genes has produced a model in which whorl fate is established through the combinator- ial action of multiple transcription factors (Figure 18-35). Thus, sepal (outermost whorl fate) is established through the action of transcription factors expressed by genes of the class A type only. Petal fate is established through the action of transcription factors produced by simultaneous MODEL ORGANISM Arabidopsis thaliana More than any other genetic model organism dis- cussed in this text, Arabidopsis is a product of the ge- nomics era. It has a genome of only 120 megabase pairs of DNA that is organized into a haploid comple- ment of five chromosomes (the diploid number is 10). Thus, Arabidopsis genome size and complexity com- pare to those of the fruit fly, Drosophila melanogaster. In contrast, the genome of corn, a genetic model or- ganism of long standing (see the Model Organism box in Chapter 13), is about 2500 Mb, almost the same as human. Another feature that makes
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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