ABO 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?

  • Three

  • one 

  • Four

  • Two

The haemoglobin content per 100 mL of blood of a normal healthy human adult is 

  • 5-11 g

  • 25-30 g

  • 17-20 g

  • 12-16 g

In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?

  • R-repolarisation of ventricles

  • S- start of systole

  • T -end of diastole

  • P- depolarization of the atria

The diagram given here is the standard ECG of a normal person. The P- wave represents the

  • Contraction of both the atria

  • initiation of the ventricular contraction

  • the beginning of the systole

  • end of systole

Which one of the following human organs is often called the “graveyard” of RBCs?

  • Gall bladder

  • kidney

  • Spleen

  • Liver

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