Biology Inheritance / Variation & Genetics MDCAT 2018
PMDC Verified Question 83 of 94
There are ____ linkage groups in human.
A
22
B
46
C
23
D
80
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 23
Concept:

A linkage group encompasses all the genes situated on a single chromosome that tend to be inherited together.

Solution:

  • The number of linkage groups in a species generally corresponds to its haploid number of chromosomes (the number of homologous pairs).
  • Humans have 23 pairs of chromosomes. Therefore, there are universally considered to be 23 linkage groups in a typical human cell (specifically in females, as they have 22 autosomes + X. Males technically have 24 distinct linkage groups due to X and Y, but standard genetic convention for human haploid linkage groups is cited as 23).


Why other options are incorrect:

  • 46: The total diploid number of chromosomes, not the number of linkage groups.
  • 22: The number of autosomal linkage groups only, ignoring the sex chromosomes.

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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