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Biology Question on Principles of Inheritance and Variation

A child of blood group O cannot have parents of blood groups

A

A and A

B

AB and O

C

A and B

D

B and B

Answer

AB and O

Explanation

Solution

  • Antigens, molecules located on the surface of red blood cells, play a crucial role in determining blood type.
    • Two primary antigenic systems exist: the ABO system and the Rh system.
    • Karl Landsteiner discovered the ABO blood group system, identifying three distinct types of RBC antigens: A, B, and O.
    • The presence or absence of the three alleles—A, B, and O—constituting the ABO gene determines an individual's blood type.
    • Each variant of the same gene is referred to as an allele. The presence or absence of specific antigens on red blood cells dictates the various blood types.
    • Alleles A and B generate type A and type B antigens, respectively, while allele O does not produce any antigen.

Consequently, based on the presence or absence of antigens on red blood cells, four blood groups can be identified: Group A, Group B, Group AB, and Group O.

Table for Group A, Group B, Group AB, and Group O.

So, the correct option is (B): AB and O.