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The Dihybrid Cross and Independent Assortment
Document Type
Learning Object
Date of this Version
2003
Citation
Plant and Soil Sciences eLibrary (PASSeL) Lesson
Abstract
This lesson examines the principle of segregation versus the principle of independent assortment and their effects on genetic data. It also addresses the concept of dominance. Understanding the inheritance of a single trait which differs between two parents is the goal of a monohybrid cross experiment. In reality though, parents rarely differ by only a single trait so the next logical step in classical genetics would be a dihybrid cross experiment.
Learning Objectives
- Compare the principle of segregation to the principle of independent assortment.
- Use the principles of segregation and independent assortment to explain the results observed in genetic data sets.
- Recognize that environment and genetics play a role in the expression of phenotype.
- Contrast complete dominance with a lack of dominance.
- Make predictions in dihybrid crosses using simple Punnet squares and the principles of independent assortment.
Modules:
COinS
Comments
Published 2003, Don Lee. Used by permission.
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 author and do not necessarily reflect the view of the U.S. Department of Agriculture.