How is the principle of segregation shown in a dihybrid cross?

The principle of segregation states states that an individual inherits a unit of information (allele) about a trait from each parent. During gamete formation, the alleles segregate from each other.

A dihybrid cross is AaBb x AaBb

but how is it SHOWN?

The classic way of diagramming the segregated alleles from both parents is with a punnett square. A punnet square is just a standard table to keep track of the variables (parental alleles) and to track the resulting gamete combinations in the cross. The columns are one parents alleles and the rows are the other parents. The contents of the table are the possible offspring combinations. Look over the next pages, they explain how to draw the table using different words and images.

http://www.science.orst.edu/bi10x/otherresources/punnett%20squares.htm

http://slms.leesummit.k12.mo.us/wdryerjr/Punnett%20Squares.htm

http://www.changbioscience.com/genetics/punnett.html

http://www.compumike.com/science/geneticspunnett2.gif

http://www.travismulthaupt.com/page13/files/Chapter11_Section02_edit.ppt

July 27 2009 04:44 am | Cross

2 Responses to “How is the principle of segregation shown in a dihybrid cross?”

Nanabhau K on 27 Jul 2009 at 10:25 am #

In a dihybrid cross,during gamete formation by each parent factors for each charactrer segregate and assorted independently so new combination of characters takes place. eg-Gametes with factors AB,Ab,aB,ab forms.
References :
Genetics-Law of segregation and Independent assortment clears this.
gardengallivant on 27 Jul 2009 at 11:00 am #

The classic way of diagramming the segregated alleles from both parents is with a punnett square. A punnet square is just a standard table to keep track of the variables (parental alleles) and to track the resulting gamete combinations in the cross. The columns are one parents alleles and the rows are the other parents. The contents of the table are the possible offspring combinations. Look over the next pages, they explain how to draw the table using different words and images.
http://www.science.orst.edu/bi10x/otherresources/punnett%20squares.htm
http://slms.leesummit.k12.mo.us/wdryerjr/Punnett%20Squares.htm
http://www.changbioscience.com/genetics/punnett.html
http://www.compumike.com/science/geneticspunnett2.gif
http://www.travismulthaupt.com/page13/files/Chapter11_Section02_edit.ppt
References :

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