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Codominance - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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Codominance is considered one of the most asked concept.
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17 Questions around this concept.
Solve by difficulty
If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group: 'B' blood group in 1:2:1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:
Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?
A gene showing codominance has :
A person which unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers blood donation without delay. What would have been the type of blood group of the donor friend?
Concepts Covered - 1
Codominance
- A variation on incomplete dominance is codominance, in which both alleles for the same characteristic are simultaneously expressed in the heterozygotes.
- Hence, in the case of co-dominance, the F1 generation resembles both parents.
- A good example is the different types of red blood cells that determine ABO blood grouping in human beings.
- ABO blood groups are controlled by the gene I, located on chromosome number 9.
- The gene (I) has three alleles
,
and
.
- The alleles IA and IB produce a slightly different form of the sugar while allele
- Because humans are diploid organisms, each person possesses any two of the three I gene alleles.
- IA and IB are completely dominant over
- But when IA and IB are present together they both express their own types of sugars: this is because of codominance.
- Hence red blood cells have both A and B types of sugars.
- Since there are three different alleles, there are six different combinations of these three alleles that are possible a total of six different genotypes of the human ABO blood types.
- In a self-cross between heterozygotes expressing a codominant trait, the three possible offspring genotypes are phenotypically distinct.
- However, the 1:2:1 genotypic ratio characteristic of a Mendelian monohybrid cross still applies.
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