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Powerpoint Presentation: Dihybrid Cross

 

Genetics Index

Chromosomes
Meiosis
Meiosis: Crossing over
Mitosis and Meiosis
Introduction to Mendelian Genetics
Test Cross
Codominance
Multiple Alleles
Pedigree Charts
Twin Studies
Dihybrid Cross : Test Cross
Autosomal Linkage
The Genetic Diagram for Linked Genes
Calculating the cross over value using a test cross
Sex determination and sex linkage
Sex linkage
Genetic diagram for sex linked genes
Blood Clotting and Haemophilia
The Retina and Daltonism
Genetic Modification
Cloning Animals
Cloning Plants

Topic Chapters Index

 

GENETICS

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The Dihybrid Cross

Studying the inheritance of two characters simultaneously.

Mendel used peas again:

dihybrid cross peas

 

Was the inheritance of one character affected by the inheritance of another?

P Phenotypes

Round Yellow  x  Wrinkled Green

(Pure Bred)

F1 Phenotypes

All Round Yellow

(Selfed)

F2 Phenotypes

 

 

 

dihybrid cross peas

 

In other words, a dihybrid cross can be treated as two separate monohybrid crosses.

dihybrid cross peas

Therefore

dihybrid cross peas

From this we can predict how many seeds we could expect to get in a sample:

In 556 seeds we could expect:

dihybrid cross prediction

It appears that the inheritance of seed shape has no influence over the inheritance of seed colour. The two characters are inherited independently The pairs of alleles that control these two characters assort themselves independently = Mendel's Second Law, The Law of Independent Assortment.

 

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