Biology Inheritance / Variation & Genetics MDCAT 2018
PMDC Verified Question 82 of 94
Which one of the following is multiple allelic character?
A
Length of stem in pea plant
B
Blood group of the human being
C
Shape of seed in pea plant
D
Colour of flower in pea plant
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Blood group of the human being
Concept:

Multiple allelism occurs when more than two alternative forms of a gene exist at a specific locus in a population.

Solution:

  • The ABO blood group in humans is determined by three distinct alleles: \(I^A\), \(I^B\), and \(i\).
  • This makes it a quintessential example of a multiple allelic character.


Why other options are incorrect:

  • Length of stem, Shape of seed, Colour of flower: These are all classic Mendelian traits in pea plants controlled by exactly two distinct alleles (e.g., Tall/Dwarf, Round/Wrinkled, Purple/White).

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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