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Codominance MCQ - Practice Questions with Answers
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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23 Questions around this concept.
Solve by difficulty
EASYABO blood groups in humans are controlled by the gene I.It has three alleles Ia,Ib and i . Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible?
A gene showing codominance has:
If two persons with the 'AB' blood group marry and have a sufficiently large number of children, these children could be classified as 'A' blood group: an 'AB' blood group: a 'B' blood group in a 1:2:1 ratio. Modern technique of protein electrophoresis reveals the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:
Which ONE of the following is the most likely ratio of blood groups among the progeny from heterozygous parents with
and
blood groups?
A person with an unknown blood group under the ABO system has suffered much blood loss in an accident and needs an 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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