Agronomy and Horticulture Department



Transformation 3 - Transformation Events

Date of this Version


Document Type



Plant and Soil Sciences eLibrary (PASSeL) Lesson


Copyright © 2003 Patricia Hain and Don Lee. Used by permission.

Peer reviewed web lesson JNRLSE approved 2003

Development of this lesson was supported in part by Cooperative State Research, Education, & Extension Service, U.S. Dept. of Agriculture under Agreement Number 98-EATP-1-0403 administered by Cornell University and the American Distance Education Consortium (ADEC). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.


Overview and Objectives - Events

This lesson defines an “event.” It explains the determining factors specific to an event, the qualities of a desirable event, and the identification and selection of desirable events.

At the completion of this lesson, you should be able to:

  • Define what an “event” is and list the 3 factors that determine an individual event.
  • Explain why some events are rejected.
  • Explain what gene silencing is and what happens to gene expression after it has occurred.
  • Describe how gene insertion could cause yield drag in transgenic plants.
  • Discuss a “non-scientific” reason why some crops are farther along in the progress with the process of genetic engineering.