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  • Explain the phenomena of dominance, multiple allelism and co-dominance taking human ABO blood group as an example.        

Explain the phenomena of dominance, multiple allelism and co-dominance taking human ABO blood group as an example.

 

 

 

 
 
 
 
 

Answers (1)

Dominance: It is the phenomenon in which the expression of only one allele in the presence of other alleles i.e., only one of the parental characters expresses. The alleles I A and IB, both are dominant over allele i and the resultant blood types are A and B respectively.

IA and IB are completely dominant over i, in other words when IA and i are present only IA expresses (because i does not produce any sugar), and when IB and i are present IB expresses.

Co-dominance: It is the phenomenon when the F1 generation shows both the parental characters i.e it resembles both the parents. Both the alleles I A and I B are co-dominant since both are able to express themselves in the presence of each other in blood group AB (IA IB) as when IA and IB are present together they both express their own types of sugars.

Multiple allelism: It is the phenomenon of a gene which expresses more than two allelic forms on the same locus. The ABO blood group in humans is determined by three different allelic forms I A, IB and i for the same character.

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Priyanka Kumari

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