Biology Inheritance / Variation & Genetics ETEA 2023 Retake
PMDC Verified Question 41 of 94
When are Rh antibodies produced in Rh -ve person?
A
Naturally before birth
B
Naturally after birth
C
After exposure to Rh antibodies
D
After exposure to Rh antigens
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: After exposure to Rh antigens
Concept:

Unlike the ABO blood group system where antibodies (anti-A/anti-B) develop naturally, the Rh system requires sensitization.

Solution:

  • An Rh-negative individual does not possess pre-existing anti-Rh antibodies in their blood plasma.
  • These antibodies are strictly produced only after exposure to Rh antigens (Rh-positive blood).
  • This exposure typically happens during a mismatched blood transfusion or when an Rh-negative mother is exposed to the blood of her Rh-positive fetus during childbirth.


Why other options are incorrect:

  • Naturally before/after birth: Rh antibodies do not form spontaneously without a triggering exposure event.
  • Exposure to antibodies: Exposure to the antigen (the foreign protein) triggers the immune response, not exposure to other antibodies.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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