Question
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because 'O' in it refers to having:
other antigens besides A and B on RBCs
over dominance of this type on the genes
one antibody only- either anti A or anti-B
no antigens A and B on RBCs
According to the sources, the ABO grouping is determined by the presence or absence of two surface antigens on the Red Blood Cells (RBCs), specifically antigens A and B . Individuals with blood group O are characterised by having no (nil) antigens on the surface of their RBCs . Genetically, this is controlled by the gene I, where the recessive allele does not produce any sugar polymers (antigens), whereas the alleles and produce slightly different forms of sugar . Therefore, an individual with the genotype results in the O blood type . Understanding these fundamental physiological and genetic principles is a high-priority strategy for medical aspirants, as NCERT textbooks serve as the primary source for approximately 95% of NEET Biology questions .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Body Fluids and Circulation. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
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