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Genetics of blood groups in human illustrates
A. Multiple alleles and codominance
B. Multiple allelism and pseudodominance
C. Pseudoallelism and codominance
D. Incomplete dominance and multiple allelism

Last updated date: 23rd Feb 2024
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IVSAT 2024
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Hint: The scientist Karl Landsteiner was the one who discovered the blood groups. He was an Austrian physician. As we already know, based on the antigenic substances on the surface of red blood cells (RBCs) and the presence and absence of antibodies, the blood groups are classified. The carbohydrates, proteins, glycoproteins, or glycolipids can be considered as the antigens. This is generally dependent on the blood group system. One can say that the blood group systems of ABO and Rh are the most critical blood group systems that determine a person's blood type for suitability in blood transfusion.

Complete answer: Humans have four blood groups they are A, B, AB, and O. It is said that a set of three multiple alleles which are present in chromosome number 9 can control the blood groups.
The genes that control blood types have been labeled as i. It is for isohemagglutinin. Six genotypes give rise to four phenotypes describing various combinations of three ABO alleles: IA, IB, and i. IA and IB are both dominant to i.
People say that the blood group of ABO is an excellent example of codominance. Heterozygous individuals IA/IB have blood group AB. Thus, genetics in human blood grouping illustrates both multiple alleles and codominance.
Pseudodominance is a condition in which the inheritance of a recessive trait imitates a dominant feature. Pseudoallelism is a condition in which two genes with the same function are present so close to each other on a chromosome that they are genetically linked.
Incomplete dominance is a phenomenon in which both alleles of a gene at a locus are partially expressed, resulting in a different phenotype.
Hence, the correct answer is option A.

Additional Information:
The ABO blood group has two antibodies and two antigens present in human blood. Antigens are antigen A and antigen B. Antibodies are antibody A and antibody B. Antigens are found on the RBCs, and the antibodies are present in the serum. Rh means Rhesus.

Genetic interactions are the set of functional associations between genes. Blood groups are named based on the inherited antigenic substances on RBCs' surface and the presence and absence of antibodies. Humans have four blood groups: A, B, AB, and O.Blood groups are controlled by a set of three multiple alleles present in chromosome number 9. The genes that control blood types have been labeled as i. i is for isohemagglutinin