Question

Which of the following is not a recognized blood group?
A. A
B. B
C. BC
D. AB

Answer 1

Hint: The presence or absence of the antigens A and B, which are carried on the surface of red blood cells, determines the ABO blood group system, which classifies human blood based on the hereditary characteristics of red blood cells (erythrocytes). Karl Landsteiner and Weiner created this system. It is the universally accepted blood group system and is always kept in mind while doing blood transfusions. A recent addition to this system is the “Bombay blood group”.

Complete answer:
Option: A – As per the ABO blood group system a person can have ‘A’ blood group and can be either Rh positive or negative.
So, Option A is not correct.
Option: B – As per the ABO blood group system a person can have ‘B’ blood group and can be either Rh positive or negative.
So, Option B is not correct.
Option: C – As per the ABO blood group system a person can have ‘A, B, AB or O’ blood group and can be either Rh positive or negative. So, a person cannot have ‘BC blood type.
So, Option C is correct as BC is not a recognized blood group.
Option: D – As per the ABO blood group system a person can have ‘AB’ blood group and can be either Rh positive or negative. Blood type AB is also an example of codominant genes.
So, Option D is not correct.

Therefore, Option C) BC is the correct answer

Note:
Sugars are the antigens of the ABO blood group. They are made by a sequence of processes involving the transfer of sugar units catalysed by enzymes. The sort of enzymes a person has, and hence the type of sugar antigens that end up on their red blood cells, is determined by their DNA. The antigens of the Rh blood type, on the other hand, are proteins. The D antigen, which is a big protein on the red blood cell membrane, is encoded by the RhD gene.