Introduction to Genetic Analysis 427

Introduction to Genetic Analysis 427 - 44200_13_p423-450...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
426 Chapter 13 The Dynamic Genome: Transposable Elements Autonomous and nonautomous elements What is the relation between Ac and Ds? How do they interact with genes and chromosomes to produce these interesting and unusual phenotypes? These questions were answered by further genetic analysis. Interactions between Ds , Ac, and the pigment gene C are used as an example in Figure 13-4. Here Ds is shown as a piece of DNA that has inactivated the C gene [the allele is called c-mutable(Ds) or c-m(Ds) for short] by inserting into its coding region. A strain with c-m(Ds) and no Ac has col- orless kernels because Ds cannot move; it is stuck in the C gene. A strain with c-m(Ds) and Ac has spotted kernels because Ac activates Ds, in some cells, to leave (called excise or transpose ) the C gene, thereby restoring gene function. Other strains were isolated in which the Ac element itself had inserted into the C gene [called c-m(Ac) ]. Unlike the
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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.

Ask a homework question - tutors are online