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  • Differentiate between incomplete dominance and co-dominace. Substantiate your answer with one example of each.        

Differentiate between incomplete dominance and co-dominace. Substantiate your answer with one example of each.

 

 

 

 
 
 
 
 

Answers (1)

INCOMPLETE DOMINANCE

Incomplete dominance is when there is a blending of the two alleles that results in a third phenotype that doesn't look like either of the parents. In this, neither of the alleles is dominant, rather combines and displays a new trait.

Example: Inheritance of flower color in the dog flower.

Phenotypic ratio - red : pink : white

                                1 : 2 : 1

Genotypic ratio-  RR : Rr : rr

                            1 : 2 : 1

CODOMINACE

Both the allele for a specific trait are equally expressed the resultant phenotype will express both the character equally of both the participating alleles.

Both the alleles are fully dominant and the traits are equally expressed.

Example: ABO blood grouping

Allele from parent 1 Allele from Parent 2 Genotype of offspring Blood type of offspring
IA IB IAIB AB
IB IA IAIB AB

ABO blood groups are controlled by the gene 'I' . the gene I have three alleles IA,IB and i. The alleles IAand IB produce a slightly different form of sugar while allele i does not produce any sugar when IAand IB are present together they both express their own type of sugar, this is because of dominance.

Posted by

Priyanka Kumari

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