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The Dihybrid Cross and Independent Assortment

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Examines the principle of segregation versus the principle of independent assortment and their effects on genetic data; and the concept of dominance.




Don Lee
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, USA

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1) Compare the principle of segregation to the principle of independent assortment.
2) Use the principles of segregation and independent assortment to explain the results observed in genetic data sets.
3) Recognize that environment and genetics play a role in the expression of phenotype.
4) Contrast complete dominance with a lack of dominance.
5) Make predictions in dihybrid crosses using simple Punnet squares and the principles of independent assortment.

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(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.


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