Question

define co-dominance in allele​

Answer 1

Answer:

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define co-dominance in allele_??

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Co-dominance: Besides incomplete dominance, certain alleles show co-dominance. Here in F, hybrid, both alleles express themselves equally and there is no mixing of the effect of the bath alleles, therefors hybrid progeny (F₁) resembles both parents. The alleles which do not show dominance-recessive relationship and are able to express themselves independently when present together are called co-dominant alleles. The symbols used for co-dominant genes are different. One method is to show by their own capital alphabets, e.g.. R (for red hair in cattle) and W (for white hair in cattle). In another method, capital base symbols are employed for both the alleles with different superscripts, eg. M. P.

ABO blood group is also a good example of co-dominance. For ABO system of blood groups, allele produces N-acetylgalactosamyl transferase enzyme which recognises H antigen present in RBC membrane and adds N-acetylgalactosamine to sugar part of H antigen to form A antigen. The allele produces galactosyl transferase enzyme which adds galactose to sugar part of H antigen to form B antigen. The alleles 1 and 18 produce a slightly different form of the sugar while allele I does not produce any sugar or antigen. I and 13 are completely dominant over i, in other words when I and i are present only ª expresses as i does not produce any sugar, and when 18 and i are present, only expresses When both IA and I are present in a person, both enzymes or sugars thus both antigens A and B are produced. This is because co-dominance. These antigens determines the type of blood group. Blood group A have antigen A, group B have antigen B, AB have both antigens while blood group O do not carry any antigen.

Answer 2

Explanation:

Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB