Multiple choice

Select the CORRECT statement regarding the Rh blood system in humans.

  1. It was the first blood type system to be discovered in humans.

  2. It is much more genetically complicated than the ABO blood type.

  3. There are 30 Rh blood types.

  4. It was discovered by Henry Landsteiner.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Rh system apparently is much more complex genetically since it involves 45 different antigens on the surface of red cells that are controlled by 2 closely linked genes on chromosome 1. In most cases, the ABO system is controlled by only two antigens.

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