Introduction to Genetic Analysis 428

Introduction to Genetic Analysis 428 - 44200_13_p423-450...

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427 13.1 Discovery of transposable elements in maize of the Ac type could be transformed into an allele of the Ds type. This transformation was due to the spontaneous generation of a Ds element from the inserted Ac ele- ment. In other words, Ds is, in all likelihood, an incom- plete, mutated version of Ac itself. Several systems like Ac/Ds were found by McClintock and other geneticists working with maize. Two other systems are Dotted ( Dt , discovered by Marcus Rhoades) and Suppressor/mutator [( Spm ), independently discovered by McClintock and Peter Peterson, who called it Enhancer/ Inhibitor ( En/In )]. In addition, as you will see in the sec- tions that follow, elements with similar genetic behavior have been isolated from bacteria, plants, and animals. The common genetic behavior of these elements led geneticists to propose new categories for all the elements. Ac and elements with similar genetic properties are now called autonomous elements because they require no other elements for their mobility. Similarly,
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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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