Explain the phenomenon of multiple allelism and codominance taking abo blood group as an example
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19
hey!!
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(a) When a gene exists in more than two allelic forms, the phenomenon is called multiple allelism.
When two alleles of a gene are not dominant over each other and expresses themselves independent of the presence or absence of others, the phenomenon is called co dominance.
Both these phenomenon can be easily explained on the basis of ABO blood grouping in humans.
The blood groups in humans are controlled by the gene I which exist in three allelic forms and Thus it shows multiple allelism . and codes for glycoprotein that protrudes from the surface of the RBCs while ‘i’ does not code for anything.
Therefore IA, and IB are codominant over each other while both are dominant over When both, IA, and IB comes together in an individual, both the types of glycoprotein are produced and hence the blood group becomes AB.
(b) Phenotype of-
(i) IA Blood group A
(ii) Blood group O
hope help u!!.
________________
_______
(a) When a gene exists in more than two allelic forms, the phenomenon is called multiple allelism.
When two alleles of a gene are not dominant over each other and expresses themselves independent of the presence or absence of others, the phenomenon is called co dominance.
Both these phenomenon can be easily explained on the basis of ABO blood grouping in humans.
The blood groups in humans are controlled by the gene I which exist in three allelic forms and Thus it shows multiple allelism . and codes for glycoprotein that protrudes from the surface of the RBCs while ‘i’ does not code for anything.
Therefore IA, and IB are codominant over each other while both are dominant over When both, IA, and IB comes together in an individual, both the types of glycoprotein are produced and hence the blood group becomes AB.
(b) Phenotype of-
(i) IA Blood group A
(ii) Blood group O
hope help u!!.
________________
Answered by
1
ABO blood group is an example of multiple allelism and co-dominance
Explanation:
- Multiple allelism occurs when a gene contains three or more than three alleles in the population. ABO blood group in humans is an example of multiple allelism because the blood group is controlled by three alleles IA, IB, and i.
- IA and IB alleles are dominant allele and i is a recessive allele. So when IA and IB come together in the offspring they both are expressed co-dominantly. So ABO blood group is also an example of co-dominance.
- Individuals with O blood groups have two recessive alleles ii. Therefore ABO blood group is an example of multiple allelism and co-dominance.
Learn more about ABO blood group:
- https://brainly.in/question/7083459
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